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QSIT Newsletter QSIT Newsletter

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We have the sad duty to inform you of the untimely death of Prof. Markus Büttiker, in the morning of October 4 2013. He is survived by his loving wife, Michele, who spent essentially every waking moment at his side the past two months. Markus Büttiker was dearly loved by his colleagues and students, and was a great man. He was an extraordinary scientist who made an incredible impact in many areas of physics. Speaking as his current and former group members, we are all very thankful for the mentoring and devoted attention he gave to us during his life. He was a wonderful teacher and advisor. He inspired many people with his deep insights into physics, his keen intuition, and his prolific activity. During his last days, he had a long line of visitors, and was able to see his collaborators and family regularly. A memorial ceremony was held in the honor of Markus Büttiker on October 15, 2013 at the

Department of Theoretical Physics at the University of Geneva. The ceremony was attended by his family as well as by representatives of the scientific community in Switzerland, Europe, and North America.

1. Scientific News

Christoph Bruder’s group, Basel: Andreas Nunnenkamp, a postdoc in Christoph Bruder's group, is part of an international team of researchers identifying signatures of the intrinsic nonlinear interaction between light and mechanical motion in cavity optomechanical systems. These signatures are observable even when the cavity linewidth exceeds the optomechanical coupling rate.

They are nonlinear variants of optomechanically induced transparency and should be observable with optomechanical coupling strengths that have already been realized in experiments. – K. Børkje, A. Nunnenkamp, J. D. Teufel, S. M. Girvin; Phys. Rev. Lett. 111, 053603 (2013). http://prl.aps.org/abstract/PRL/v111/i5/e053603

Matthias Christandl’s group, Zurich: Entanglement Polytopes: Multiparticle Entanglement from Single-‐Particle Information: Entangled many-‐body states are an essential resource for quantum computing and interferometry. Determining the type of entanglement present in a system usually requires access to an exponential number of parameters. We show that in the case of pure, multiparticle quantum states, features of the global entanglement can already be extracted from local information alone. This is achieved by associating any given class of

entanglement with an entanglement polytope—a geometric object that characterizes the single-‐particle states compatible with that class. Our results, applicable to systems of arbitrary size and statistics, give rise to local witnesses for global pure-‐state entanglement and can be generalized to states affected by low levels of noise. – M. Walter, B. Doran, D. Gross, M. Christandl; Science 7, 340, 1205 (2013). http://www.sciencemag.org/content/340/6137/1205.full

Newsletter October 2013

http://www.sciencemag.org/content/340/6137/1205.full

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Klaus Ensslin’s group, Zurich: Imaging magnetoelectric subbands in ballistic constrictions: Scanning gate experiments on ballistic constrictions have been performed in the presence of small perpendicular magnetic fields. The constrictions form the entrance and exit of a circular gate-‐defined ballistic stadium. Close to constrictions we observe sets of regular fringes creating a checker board pattern. Inside the stadium conductance fluctuations governed by chaotic dynamics of electrons are visible. The checker board pattern allows us to determine the number of transmitted modes in the constrictions forming between the tip-‐ induced potential and gate-‐defined geometry. Spatial investigation of the fringe pattern in a perpendicular magnetic field shows a transition

from electrostatic to magnetic depopulation of magnetoelectric subbands. Classical and quantum simulations agree well with different aspects of our observations. The quantitative understanding of features observed in scanning gate experiments opens the door for a detailed investigation of the self-‐consistent potential landscape. Furthermore, the fact that transport is ballistic and phase coherent on the length scale of the stadium can be used for future experiments on the classical and quantum dynamics of confined mesoscopic systems. – A. A. Kozikov, D. Weinmann, C. Rössler, T. Ihn, K. Ensslin, C. Reichl and W. Wegscheider; N. J. Phys. 15, 083005 (2013). http://arxiv.org/abs/1305.0354

Tilman Esslinger’s group, Zurich: A quantum simulator for magnetic materials: Quantum magnetism originates from the exchange coupling between quantum mechanical spins. Here, we report on the observation of nearest-‐neighbor magnetic correlations emerging in the many-‐body state of a thermalized Fermi gas in an optical lattice. The key to obtaining short-‐range magnetic order is a local redistribution of entropy, which allows temperatures below the exchange energy for a subset of lattice bonds. When loading a repulsively interacting gas into either dimerized or anisotropic simple cubic configurations of a tunable-‐geometry

lattice, we observe an excess of singlets as compared with triplets consisting of two opposite spins. For the anisotropic lattice, the transverse spin correlator reveals antiferromagnetic correlations along one spatial axis. Our work facilitates addressing open problems in quantum magnetism through the use of quantum simulation. – D. Greif, T. Uehlinger, G. Jotzu, L. Tarruell, T. Esslinger; Science 340, 1307 (2013). http://www.sciencemag.org/content/340/6138/1307.full

A Thermoelectric Heat Engine with Ultracold Atoms: Thermoelectric effects, such as the generation of a particle current by a temperature gradient, have their origin in a reversible coupling between heat and particle flows. These effects are fundamental probes for materials and have applications to cooling and power generation. Here, we demonstrate thermoelectricity in a fermionic cold atoms channel in the ballistic and diffusive regimes, connected to two reservoirs. We show that the magnitude of the effect and the efficiency of energy conversion can be optimized by controlling

the geometry or disorder strength. Our observations are in quantitative agreement with a theoretical model based on the Landauer-‐Büttiker formalism. Our device provides a controllable model-‐system to explore mechanisms of energy conversion and realizes a cold atom based heat engine. – J.-‐P. Brantut, C. Grenier, J. Meineke, D. Stadler, S. Krinner, C. Kollath, T. Esslinger, A. Georges; Science, published online, 24 October 2013. http://www.sciencemag.org/content/early/2013/10/23/science.1242308.full

Nicolas Gisin’s group, Geneva: Displacement of entanglement back and forth between the micro and macro domains: Quantum theory is often presented as the theory describing the microscopic world, and admittedly, it has done this extremely well for decades. Nonetheless, the question of whether it applies to macroscopic scales remains open, despite many efforts. Here, we report on entanglement exhibiting strong analogies with the Schrödinger cat state as it

involves two macroscopically distinct states-‐ two states that can be efficiently distinguished using detectors with no microscopic resolution. Specifically, we start by generating entanglement between two spatial optical modes at the single-‐photon level and subsequently displace one of these modes up to almost a thousand photons. To reliably check whether entanglement is preserved, the state is redisplaced back to the single-‐photon level and a

http://www.sciencemag.org/content/340/6138/1307.full

http://www.sciencemag.org/content/early/2013/10/23/science.1242308.full

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well-‐established entanglement measure, based on single-‐photon detection, is applied. Our results provide a tool to address fundamental questions about quantum theory and hold potential for more applied problems, for instance in quantum sensing.

– N. Bruno, A. Martin, P. Sekatski, N. Sangouard, R. T. Thew and N. Gisin; Nature Physics 9, 547,(2013). http://www.nature.com/nphys/journal/v9/n9/full/nphys2681.html

Demonstration of genuine multipartite entan-‐glement with device-‐independent witnesses: Entanglement in a quantum system can be demonstrated experimentally by performing the ments prescribed by an appropriate entanglement witness. However, the unavoidable mismatch between the implementation of measurements in practical devices and their precise theoretical modeling generally results in the undesired possibility of false-‐positive entanglement detection. Such scenarios can be avoided by using the recently developed device-‐independent entanglement witnesses (DIEWs) for genuine multipartite entanglement. Similarly to Bell inequalities, the only

assumption of DIEWs is that consistent measurements are performed locally on each subsystem. No precise description of the measurement devices is required. Here we report an experimental test of DIEWs on up to six entangled 40Ca+ ions. We also demonstrate genuine multipartite quantum nonlocality between up to six parties with the detection loophole closed. -‐ J.T. B arreiro, J.-‐D. Bancal, P. Schindler, D. Nigg, M. Hennrich, T. Monz, N. Gisin , R. Blatt; Nature Physics 9, 559 (2013). http://www.nature.com/nphys/journal/v9/n9/full/nphys2705.html

Nicolas Gisin’s group, Geneva, and Renato Renner’s group, Zurich: Device-‐Independent Quantum Key Distribution with Local Bell Test: Device-‐independent quantum key distribution (DIQKD) in its current design requires a violation of a Bell’s inequality between two parties, Alice and Bob, who are connected by a quantum channel. However, in reality, quantum channels are lossy and current DIQKD protocols are thus vulnerable to attacks exploiting the detection loophole of the Bell test. Here, we propose a novel

approach to DIQKD that overcomes this limitation. In particular, we propose a protocol where the Bell test is performed entirely on two casually independent devices situated in Alice’s laboratory. As a result, the detection loophole caused by the losses in the channel is avoided. – C.C. W. Lim, C. Portmann, M. Tomamichel, R. Renner, and N. Gisin; Phys. Rev. X 3, 031006 (2013). http://prx.aps.org/abstract/PRX/v3/i3/e031006

Nicolas Gisin’s group and Hugo Zbinden's group, Geneva: A recent collaboration between the Geneva groups of Hugo Zbinden and Nicolas Gisin and the University of Stanford has shown for the first time a nonlinear interaction between two single photons.

Typically their non-‐interactive nature allows the photons to travel long distances, which makes them ideally suited to quantum communication experiments. This new approach now opens the door to more complex processing operations, for example, faithfully heralding entanglement generation over long distances. – T. Guerreiro, E. Pomarico, B. Sanguinetti, N. Sangouard, J. S. Pelc, C. Langrock, M. M. Fejer, H. Zbinden, R. T. Thew & N. Gisin; Nature Com-‐munications 4, 15 (2013). http://www.nature.com/ncomms/2013/130815/ncomms3324/full/ncomms3324.html

Special collaboration within QSIT: A new joint project was started between the QSIT groups of G. Blatter, P. Maletinsky and S.D. Huber. The project aims at exploring the potential of

quantum sensors for the study of topological states of matter. A central goal of this collaboration is to identify and implement experimental schemes that

http://www.nature.com/ncomms/2013/130815/ncomms3324/full/ncomms3324.html

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enable the study of central building blocks of topologically non-‐trivial materials using the novel quantum sensors currently under development in the Maletinsky group at the University of Basel. The

project is a unique combination of our expertise in theoretical and experimental solid state physics and involves groups from ETH Zurich and the University of Basel.

Patrick Maletinsky’s group: Nanoscale magnetic imaging of a single electron spin under ambient conditions: The detection of ensembles of spins under ambient conditions has revolutionized the biological, chemical and physical sciences through magnetic resonance imaging1 and nuclear magnetic resonance. Pushing sensing capabilities to the individual-‐spin level would enable unprecedented applications such as single-‐molecule structural imaging; however, the weak magnetic fields from single spins are undetectable by conventional far-‐field resonance techniques. In recent years, there has been a considerable effort to develop nanoscale scanning magnetometers, which are able to measure fewer spins by bringing the sensor in close proximity to its target. The most sensitive of these magnetometers generally require low temperatures for operation, but the ability to measure under ambient conditions (standard temperature and pressure) is critical for many imaging applications, particularly in biological

systems. Here we demonstrate detection and nanoscale imaging of the magnetic field from an initialized single electron spin under ambient conditions using a scanning nitrogen-‐vacancy magnetometer. Real-‐space, quantitative magnetic-‐field images are obtained by deterministically scanning our nitrogen-‐vacancy magnetometer 50 nm above a target electron spin, while measuring the local magnetic field using dynamically decoupled magnetometry protocols. We discuss how this single-‐spin detection enables the study of a variety of room-‐temperature phenomena in condensed-‐matter physics with an unprecedented combination of spatial resolution and spin sensitivity. – M. S. Grinolds, S. Hong, P. Maletinsky, L. Luan, M. D. Lukin, R. L. Walsworth, A. Yacoby, Nature Physics 9, 215 (2013). http://www.nature.com/nphys/journal/v9/n4/full/nphys2543.html

Patrick Maletinsky’s group, Basel and Atac Imamoglu’s group , Zurich: Nuclear spin physics in quantum dots: An optical investigation: The mesoscopic spin system formed by the 104–106 nuclear spins in a semiconductor quantum dot offers a unique setting for the study of many-‐body spin physics in the condensed matter. The dynamics of this system and its coupling to electron spins is fundamentally different from its bulk counterpart or the case of individual atoms due to increased fluctuations that result from reduced dimensions. In recent years, the interest in studying quantum-‐dot nuclear spin systems and their coupling to confined electron spins has been further fueled by its importance for possible quantum information processing applications. The fascinating nonlinear (quantum) dynamics of the coupled electron-‐nuclear spin system is universal in quantum dot optics and transport. In this article, experimental work performed over the last decade in studying this mesoscopic, coupled electron-‐

nuclear spin system is reviewed. Here a special focus is on how optical addressing of electron spins can be exploited to manipulate and read out the quantum-‐dot nuclei. Particularly exciting recent developments in applying optical techniques to efficiently establish nonzero mean nuclear spin polarizations and using them to reduce intrinsic nuclear spin fluctuations are discussed. Both results critically influence the preservation of electron-‐spin coherence in quantum dots. This overall recently gained understanding of the quantum-‐dot nuclear spin system could enable exciting new research avenues such as experimental observations of spontaneous spin ordering or nonclassical behavior of the nuclear spin bath. – B. Urbaszek, X. Marie, T. Amand, O. Krebs, P. Voisin, P. Maletinsky, A. Högele, A. Imamoglu; Rev. Mod. Phys., 85, 1 (2013) http://rmp.aps.org/abstract/RMP/v85/i1/p79_1

Martino Poggio’s group, Basel:Harnessing nuclear spin polarization fluctuations in a semiconductor nanowire: First Report of Real-‐Time Manipulation and Control of Nuclear Spin Noise: Physicists from Martino Poggio's group, in collaboration with researchers at

the Eindhoven and Delft Universities of Technology, have demonstrated a new method for polarizing nuclear spins in extremely small samples. The scheme may provide a route for enhancing the sensitivity of nanometer-‐scale magnetic resonance


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imaging (MRI) or possibly for the implementation of solid-‐state quantum computers. The researchers have published their work in the journal Nature Physics.

– P. Peddibhotla, F. Xue, H. I. T. Hauge, S. Assali, E. P. A. M. Bakkers & M. Poggio; Nature Physics 9, 631 (2013) http://www.nature.com/nphys/journal/v9/n10/full/nphys2731.html

Richard Warburton’s group, Basel: Charge noise and spin noise in a semiconductor quantum device: Andreas Kuhlmann and co-‐workers in Richard Warburton’s group have succeeded in identifying the noise sources which limit the performance of a semiconductor quantum dot as single photon source and spin qubit. In particular, a spectroscopic technique has been discovered which allows charge noise and spin noise to be measured separately. Remarkably, the noise in the fluctuating nuclear spins can be observed, facilitating a direct measurement of the

correlation time. Both charge noise and spin noise fall rapidly with increasing frequency. This allows the creation of ideal, transform-‐limited photons on short time-‐scales. – A. Kuhlmann et al., Nature Physics 9, 570 (2013) http://www.nature.com/nphys/journal/v9/n9/full/nphys2688.html – Discussed in News and Views by Hendrik Bluhm, Nature Physics 9, 538 (2013) http://www.nature.com/nphys/journal/v9/n9/full/nphys2721.html

Andreas Wallraff’s group, Zurich: Deterministic quantum teleportation with feed-‐forward in a solid state system: Quantum teleportation describes the concept of transferring an unknown quantum state from a sender to a physically separated receiver without transmitting the physical carrier of information itself. Instead, teleportation makes use of the non-‐local correlations provided by an entangled pair shared between the sender and the receiver and the exchange of classical information. We have teleported information for the first time in a solid state system. In our chip-‐based superconducting circuit architecture we have realized the full deterministic quantum teleportation protocol using quantum-‐limited parametric amplifiers, a crossed quantum bus technology and flexible real-‐time digital electronics. The teleportation process succeeds with order unit probability for any input state, as we reliably prepare entangled states as a resource and are able to distinguish all four maximally entangled Bell states in a single measurement. We analyze the Bell-‐state measurement in real time by using fast electronics based on a field programmable gate array (FPGA) and realize conditional operations in a feed-‐forward step. We have achieved an average process fidelity of (62.2±0.3) % for the full quantum teleportation algorithm, which is clearly above the classical threshold of 50 %.

– L. Steffen, Y. Salathe, M. Oppliger, P. Kurpiers, M. Baur, C. Lang, C. Eichler, G. Puebla-‐Hellmann, A. Fedorov, and A. Wallraff, Nature 500, 319-‐322 (2013) http://www.nature.com/nature/journal/v500/n7462/full/nature12422.html – doi:10.1038/nature12422 http://www.ethlife.ethz.ch/archive_articles/130815_teleportation_fb/index_EN http://www.qudev.ethz.ch/news#39862

In our chip-‐based superconducting circuit three qubits are coupled to three resonators to realize deterministic quantum teleportation.



http://www.nature.com/nature/journal/v500/n7462/full/nature12422.html

http://www.ethlife.ethz.ch/archive_articles/130815_teleportation_fb/index_EN

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2. Technology Transfer:

In less than a year, QSIT scientists and engineers have contributed 10 projects to QSIT’s newly launched technology transfer initiative qstarter. Find the latest inventions of our network displayed in a comprehensible way at http://www.qstarter.ch One-‐minute introductory videos, datasheets and a short project description help you to quickly evaluate whether these inventions could be useful for your research. If you would like to see your own inventions applied in a larger context, become a qstarter yourself: http://www.qstarter.ch/become-‐a-‐qstarter

Hugo Zbinden's group, Geneva: New open hardware electronics platform for researchers: Did you develop some electronic circuitry you would like to make available for your colleagues? Are you wondering if the electronics you need has already been developed elsewhere? GAP-‐optique introduces easy 𝞿, a modular electronics platform that should make the development of your custom electronics easier and

encourage the exchange of know-‐how and hardware. Soon racks and a series of basic modules will be available. Standard empty modules simplify the development of your own devices, the power supplies and interfaces being supplied by the system. Have a look at http://www.easy-‐phi.ch/ and let us know what you think about this project.

3. Awards and grants: An ERC Advanced Grant 2013 was awarded by the European Research Council (ERC) to Markus Büttiker for his project entitled “Floquet Computer”, FLOQUET Jérôme Faist for his research on “Quantum Metamaterials in the Ultra Strong Coupling regime“, MUSiC Nicolas Gisin for his project on „Macroscopic Entanglement in Crystals“, MEC Lukas Novotny for his project called “Quantum Mesoscopics with Vacuum Trapped Nanoparticles“, QMES Andreas Wallraff for the project "Superconducting Quantum Networks”. From 2014 the funds will be used to investigate ways of developing networks for quantum computers based on superconducting electronic circuits. The project focuses on the development of networks that can connect

individual quantum chips at distances ranging from a few centimeters to several meters. The newly received grant follows up the ERC Starting Grant that Andreas Wallraff received in 2009. An ERC Starting Grant 2013 was awarded by the European Research Council (ERC) to Matthias Christandl for his research project entitled “Multipartite Quantum Information Theory”, QMULT Martino Poggio for his research project entitled, "Bottom-‐up Nanowires as Scanning Multifunctional Sensors", NWScan for short. NWScan is set to start on the 1st of November, 2013 and is planned to run for 5 years. A new European IP-‐FET project entitled DIADEMS was initiated in early 2013 with important contributions from Patrick Maletinsk’s group in Basel. The project started its activities at the beginning of September with a kickoff meeting in

qstarter is QSIT’s very own technology transfer initiative. It provides a web platform for QSIT scientists to promote their lab inventions. At the yearly qstarter award lunch QSIT’s Industry Partners (ABB, IBM, Sensirion, IdQuantique, Zurich Instruments, Specs) meet the inventors and award the best projects with 1000 CHF each.

http://www.qstarter.ch/become-a-qstarter

http://www.easy-phi.ch/

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Paris. DIADEMS brings together leading European groups in the field of Quantum Sensing and has a focus on employing electronic spins in Nitrogen-‐Vacancy centres in Diamond for sensory applications. The Quantum Sensing group in Basel is leading one of five scientific workpackages within DIADEMS and plays a key role in the consortium. Anana Fontcuberta i Morral will be given the title of Ambassador of the Technical University of Munich. The prestigious “2013 European Quantum Information Young Investigator Award” has been awarded to Fernando Brandao for his highly

appraised achievements in entanglement theory, quantum complexity theory, and quantum many-‐body physics, which combine dazzling mathematical ability and impressive physical insight. Fernando Brandao was a postdoc in the groups of Renato Renner and Matthias Christandl and holds now a position as lecturer at the University College London: http://www.cqstar.eu/QIPC/award.html

Congratulations!

4. Recent Events

7th Nanowire growth workshop June 10 –12, 2013, LausanneIn June 2013 Anna Fontcuberta i Morral co-‐organized this workshop at the EPFL in Lausanne joining international researchers in the field. The workshop is intended to provide a forum for lively discussion on the growth of semiconductor

nanowires. The workshop was attended by 130 participants and the program hosted 3 plenary and 9 invited speakers, beside regular talks and a poster session. http://lmsc.epfl.ch/page-‐83944-‐en.html

Scientific Retreat June 27–28, 2013, Rigi, SZMembers of the groups of Gianni Blatter, Tilman Esslinger, Sebastian Huber, and Atac Imamoglu met with international visitors from Germany, the United States and Israel for a focused scientific retreat on the mountain Rigi. The program allowed for in-‐depth discussion of topics of common interest. Additionally we had 8 invited short talks. The aim of the retreat was to identify hot topics that can be addressed with the quantum simulators developed under the umbrella of the NCCR. Several collaborations and the design of the lecture currently held by Tilman Esslinger, Tobias Donner and Sebastian Huber found their origin in the retreat. We plan to organize other retreats with the same focused format and we are looking forward to participation from a hopefully diverse range of

researchers from within the NCCR QSIT while keeping the number of participant at the small number that allows for the intensive exchange.

Quantum Nano-‐ and Micromechanics July 21 -‐ 25, 2013, Centro Stefano Franscini, Monte Verità, TI, Switzerland Nano and micromechanical oscillators are an enabling technology for precision experiments of mass force or displacement. In recent years it has become possible to control such mesoscopic systems at the quantum level, by coupling them to photons or artificial superconducting circuits. This research, at the interface of quantum optics, condensed matter Physics with Nanotechnology, has rapidly advanced in the last years. On the

applied side such studies enable entirely novel optical devices that use the interactions of photons and phonons. On a fundamental level, this research constitutes test of quantum mechanics on a macroscopic scale. This summer organized by T. Kippenberg, M. Aspelmeyer, and M. Poggio brought together leading researchers in this new domain of physics. http://qnm2013.epfl.ch

http://lmsc.epfl.ch/page-83944-en.html

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2nd Workshop on Cold Molecular Ions Sept 2 – 5, 2013 Arosa, GRThe 2. Workshop on Cold Molecular Ions, organized by Stefan Willitsch (University of Basel) and Roland Wester (University of Innsbruck), was held from Sept. 2-‐5, 2013, at Waldhotel National in Arosa. Supported by NCCR QSIT, the workshop provided a platform for scientific exchange and developing new collaborations in this emerging cross-‐disciplinary field. Topics ranging from new quantum technologies based on molecular ions to chemistry and precision spectroscopy were covered at the meeting. Speakers included Dietrich Leibfried (NIST), Jonathan Home (ETH), Stephan Schiller (Uni Düsseldorf) and Michael Drewsen (Uni Aarhus).

http://www.uibk.ac.at/ionen-‐angewandte-‐physik/ions-‐in-‐arosa/index.html.en

Scientifica 2013 Aug 30 – Sept 1, 2013, Zurich With a booth presenting information and demonstration experiments about safer data transfer thanks to qubits, the NCCR QSIT presented

its research to the general public at the Scientifica 2013, taking place in Zurich from Friday, 30. 08. till Sunday, 01. 09. 2013. The visitors’ interest to understand quantum phenomena such as quantum teleportation or quantum cryptography was very motivating for our 25 PhDs and post docs that were involved in preparing and presenting the exhibition. With more than 20.000 visitors in total, this year’s Scientifica achieved a new record attendance. From a Fermi-‐type calculation, we estimate that we were able to personally interact at our booth with about 3000 people and to convey a general impression of our research to many more. http://www.scientifica.ch/ausstellung/gesellschaft-‐und-‐technologie/sicherere-‐datenuebertragung-‐dank-‐qubits/

Public lectures / outreach talksJune 5, 2013 Approximately 160 children aged 9 to 12 years old attended a special lecture by Klaus Ensslin in the large physics auditorium on the Hönggerberg. On the basis of many experiments the children were led through the world of mechanics. In the extended break the kids had plenty of time to try out some of these experiments themselves. The kids seized the opportunity with enthusiasm. October 13, 2013 Nicolas Gisin gave a public talk with the title ‘When science meets science fiction: From Newton to teleportation’ at the All-‐Russia Science Festival 2013 in Moscow. http://www.festivalnauki.ru/meropriyatie-‐festivalya/20132/lekciya-‐professora-‐nikolya-‐gizina-‐kogda-‐vstrechayutsya-‐nauka-‐i

October 17, 2013 "Nano-‐lunch lecture" held by Patrick Maletinsky for young and prospective students of nanosciences at the University of Basel. Title: "Quanten-‐Sensorik zur Erforschung der Nanowelt".

http://www.uibk.ac.at/ionen-angewandte-physik/ions-in-arosa/index.html.en

http://www.scientifica.ch/ausstellung/gesellschaft-und-technologie/sicherere-datenuebertragung-dank-qubits/

http://www.festivalnauki.ru/meropriyatie-festivalya/20132/lekciya-professora-nikolya-gizina-kogda-vstrechayutsya-nauka-i

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5. Mini-sabbaticals

In the last 6 months the following Mini-‐sabbaticals took place: – Dario Maradan from Dominik Zumbühl’s group, Basel, visited Christian Degen’s group, ETHZ. Topic: Linear motor drive for a PT system.. – Dennis Weber from Martino Poggio’s group, Basel, visited Gian Salis’ group, IBM Research–Zurich. Topic: Magneto-‐optical Kerr effect in nanotubes.

– Marcel Pfaffhauser from Stefan Wolf’s group, USI Lugano, visited André Stefanov’s group, Bern. Topic: Informational data analysis of photonics qudits. – Bänz Bessire from André Stefanov’s group, Bern, visited Stefan Wolf’s group, USI Lugano. Topic: Informational data analysis of photonics qudits. http://www.nccr-‐qsit.ethz.ch/education/minisabbaticals

6. Agenda

NCCR QSIT Site Visit December 2 – 3, 2013 ETH Science City, HIT Building

NCCR QSIT Winter School February 3 -‐ 5, 2014

NCCR QSIT General Meeting February 5 – 7, 2014 Waldhotel National, Arosa Organizer: NCCR QSIT

7. New collaborators

Arne Barfuss, joined the quantum sensing group of Patrick Maletinsky as a PhD student. Arne has previously worked on transport experiments on topological insulators at the University of Würzburg and will now join our efforts on hybrid spin-‐optomechanical sys-‐tems.

Lucas Casparis is a forth year graduate student in the Basel microkelvin team of Dominik Zumbühl working on single spins and back action effects in surface gate defined nanostructures formed in 2D electron gases.

Each PhD student and post-‐doc associated with this NCCR has the opportunity to work one week per year in another NCCR group of his/her choice. This step will promote collaboration and exchange between the younger researchers and will also serve the purpose of general education. These research stages will be centrally financed by the NCCR and are open for all young researchers working on NCCR-‐related projects in the participating research groups, even if the salary of these researchers is not directly provided by NCCR resources. Please contact your supervisor or the NCCR office for further information.

http://www.nccr-qsit.ethz.ch/education/minisabbaticals


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Philipp Kammerlander is a new graduate student in Renato Renner’s group since September 2013. He will be working on a joint QSIT project planned with Jonathan Home.

In September Heidi Potts joined Anna Foncuberta I Moral’s group. She will be highly involved in QSIT as she will grow nanowire heterostructures for quantum transport.

Murad Tovmasyan started his PhD in the group of Sebastian Huber in the beginning of September 2013. Murad is working on the theory of low-‐dimensional interacting quantum systems with a focus on transport through topological ladders and graphene, where he will collaborate closely with the experimental group of Patrick Maletinsky in Basel.

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