lecture 23 laser cooling; cold atoms & ions
DESCRIPTION
Lecture 23 Laser cooling; cold atoms & ions. Reminder: Lecture notes taker: none(?) HWK 5 problem 12.3 deleted (assigned before); due date Wed 4/30 class Paper due Wed 4/30 Final exam date: 5/5 Monday evening 7-9pm Room 201 self-made 1 eq. sheet permitted; FQ (all) + FO (1-5) - PowerPoint PPT PresentationTRANSCRIPT
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 1
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Lecture 23
Single Photon Source;
Coherent State
Read: FQ6-7
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 2
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
coherence & 1st order correlation [g(1)] Coherence:•Temporal•Spatial
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 3
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
2nd order correlation function
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 4
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
HBT with photons
(Single) photon
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 5
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Hardware requirements/complications
• (reliable) Single photon source[multiphoton emission compromises security by giving Eve
more chances to evade detection (both Eve’s detectors click knows basis wrong)]
– Attenuated single-freq laser: photon Poisson distr, subject to multi-photons
– “on-demand” single photon source [current research]
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 6
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 7
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 8
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
On-demand single-photon source“photon gun”
An example (optical trigger)
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 9
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Questions:
•Why g2(0)>0?
•Antibunching == sub-poissonian?
Solid state sources
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 10
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Wave particle duality
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 11
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
single photons->antibunching
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 12
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Quantum nature of light
• quantized energy (photon)
• Quantized EM field
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 13
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Fox FQ’Chap7
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 14
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Light as classical EM wave (oscillator)
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 15
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Classical Harmonic Oscillator
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 16
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Light as classical EM wave (oscillator)
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 17
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Phasor diagram and field quadratures (dimensionless)
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 18
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Quantum harmonic oscillator
photon
• Zero-point fluctuationvacuum field
• Shot noise• Number-phase uncertainty
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 19
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Vacuum field
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 20
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Casimir Force
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 21
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Coherent State
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 22
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/
Number phase relation
Purdue University Spring 2016 Prof. Yong P. Chen ([email protected]) Lecture 18 (3/24/2016) Slide 23
Introduction to Quantum Photonics & Quantum Optics
PHYS522 ECE695
(“Coherent Optics & Quantum Electronics”) http://www.physics.purdue.edu/academic_programs/courses/phys522/