quantum simulations with yb + crystal ~5 m trapped atomic ions
TRANSCRIPT
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Quantum Simulations with
Yb+ crystal
~5 mm
Trapped Atomic Ions
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Ramanbeatnotes:
wHF ± m
ki
tik
tik
ki
kixi
kk eaeabxkH,
)()(0
)( ][ˆ †
uppersidebands
frequencywHF+m
carrierlower
sidebands
wHF -m
global spin-dependent oscillating force
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ki
tik
tik
ki
kixi
kk eaeabxkH,
)()(0
)( ][ˆ †
k
kkik
kii aa ])()([)(ˆ *
)sincos()(22
,
ki
k
ikiki ie
ik
†
phonons
k kk
k
kk
k
k
kjkijiji
bb
m
k
2
2sin
)(
)sin(
)(
)sin(
2
)()(
22
,,2
,
interaction between qubits (entangling gates etc..)
ji
jx
ixji
i
ixi iU
,
)()(,
)( )()(ˆexp)(
evolution operator
...)]](),([),([
6)](),([
2
1)(exp)(
232
0
1231
0
2
0
3
0
121
0
2
0
ttt
tHtHtHdtdtdti
tHtHdtdttdtHiU
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“Adiabatically eliminate” phonons: | - m wk| >> hW0 “SLOW MOLMER”
1)sincos()( ,22
,
k
ikik
i
k
ikiki
iie
ik
)()(, ˆˆ j
xi
xji
jieff JH
k k
kj
kiji
ji
bb
m
kJ
22
2
, 2
)(
General effective Hamiltonian theory:D. F. James, Canadian J. Phys. 85, 625 (2007)
uppersidebands
frequency
carrierlower
sidebands
m
wk
sidebandlinewidth= iki ,
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Ramanbeatnote:
mwHF ± m
uppersidebands
frequencywHF+m
carrierlower
sidebands
wHF -m
)()(, ˆˆ j
xi
xji
jieff JH
m m
mj
mi
jiji
bb
m
kJ
22
2
, 2
i
iyB )(̂
wHF ( = /2Df p ) wHF
control
normal modeeigenvectors(ion i mode m)
IsingModel
global spin-dependent oscillating force
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Quantum Simulation: What is it?
Hdt
di
Y Describes N interacting systems, each system having D degrees of freedom
DN coupled differential equations
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Hdt
di
PhysicalSystem
Y
TrialH
Hdt
di
PhysicalSystem
Y
ChooseH
Two approaches
(1)
(2)
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i
iy
jx
ix
jijieff BJH )()()(
, ˆˆˆ
Quantum simulations with trapped ions
Porras and Cirac, PRL 92, 207901 (2004)Deng, Porras, Cirac, PRA 72, 063407 (2005)Taylor and Calarco, PRA 78, 062331 (2008)
A. Friedenauer, et al., Nature Phys. 4, 757 (2008)K. Kim et al., Phys. Rev. Lett. 102, 250502 (2009)K. Kim et al., Nature 465, 590 (2010)E. Edwards et al., Phys. Rev. B 82, 060412 (2010)J. Barreiro et al., Nature 470 , 486-491 (2011)R. Islam, et al., Nature Comm. 2, 377 (2011)B. Lanyon et al., Science 334, 57 (2011)J. Britton et al., Nature 484, 489 (2012)A. Khromova et al., PRL 108, 220502 (2012) R. Islam, et al., Science 340, 583 (2013)P. Richerme, et al., ArXiv 1303.6983 (2013) P. Richerme, et al., ArXiv 1305.2253 (2013)
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Frustration and Entanglement ?AFM
AFM
AFM
Spin Liquids
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1936: Giauque and Stout, “The Entropy of Water and the Third Law of Thermodynamics. Heat Capacity of Ice from 15 to 273°K”
Zero-point entropy in 'spin ice’, A. P. Ramirez, A. Hayashi, R. J. Cava, R. Siddharthan and B. S. Shastry, Nature 399, 333 (1999)(pyrochloric “spin ice” Dy2Ti2O7)
1945: L. Pauling The Nature of the Chemical Bond (Cornell Univ. Press), pp. 301-4
Ice
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Control Range of Interaction!
Theory
ji
1
~
Pow
er L
aw E
xpon
ent a
COM
uppersidebands
frequencywHF
carrierlower
sidebands
Dw
-m wCOM
tunelaserhere
tunelaserhere
k k
kj
ki
ji
bb
m
kJ
22
22
, 2
)(
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Initialization
CoolingOptical PumpingSpins along y(or against y)
DetectionMeasure each spin along x)()(
, ˆˆ jx
ix
jijiJ
i
iyB )(̂
time
Adiabatic Quantum Simulation
i
iy
jx
ix
jijieff tBJH )()()(
, ˆ)(ˆˆ
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A. Friedenauer, et al., Nature Phys. 4, 757 (2008)
N=2
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B/Jrms 0.210
0.50
0.25
0.000 100 200 300
0.50
0.25
0.000 100 200 300
t (ms)
B/Jrms 0.210
t (ms)
Exact Ground StateMeasured Populations
J12=J13=J23 < 0
Initialization
CoolingOptical PumpingSpins along y
DetectionMeasure each spin along x)()(
, ˆˆ jx
ix
jijiJ
i
iyB )(̂
time
P↓↓↓
P↓↓↑
P↓↑↓
P↓↑↑
P↑↓↓
P↑↓↑
P↑↑↓
P↑↑↑
P↓↓↓, P↑↑↑
E. Edwards, et al., Phys. Rev. B 82, 060412 (2010)
N=3
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B/Jrms
0.50
0.25
0.000 100 200 300
0.50
0.25
0.000 100 200 300
t (ms)
B/Jrms
t (ms)
J12=J13=J23 > 0
0.21010
P↓↓↓
P↓↓↑
P↓↑↓
P↓↑↑
P↑↓↓
P↑↓↑
P↑↑↓
P↑↑↑ P↓↓↓, P↑↑↑
Initialization
CoolingOptical PumpingSpins along y
DetectionMeasure each spin along x)()(
, ˆˆ jx
ix
jijiJ
i
iyB )(̂
time
0.2
E. Edwards, et al., Phys. Rev. B 82, 060412 (2010)
Exact Ground StateMeasured Populations
N=3
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FM
Ferromagnetic couplingsFM FM
J12=J13=J23 < 0
K. Kim, et al., Nature 465, 590 (2010)
|Y = |+|
ground state is entangled
P0 P1 P2 P3
Bx=0
|Y2 = |
no entanglement
|Y1 = |
no entanglement
Bx0
P0 P1 P2 P3
symmetrybreaking field Bx
N=3
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Competing AFM: spin frustration
AFM
AFM AFM
J12=J13=J23 > 0
?
K. Kim, et al., Nature 465, 590 (2010)
|Y = | +|+| +| +|+|
ground state is entangled Bx=0
P0 P1 P2 P3
|Y1 = | +|+|
still entangled!
symmetrybreaking field Bx
|Y2 = | +|+|
still entangled!
Bx0
P0 P1 P2 P3
Frustration Entanglement
N=3
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Emergence of ferromagnetism vs. # spins N(all FM couplings: Jij<0)
|mx|
R. Islam et al., Nature Communications 2, 377 (2011)
t(ms)
0
0.25
0.5
B/|J|
N
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4J
B1
J
B 3.0J
B05.0
J
B12
J
B
Ion index, j
Time/τ0 52.5
0
12
6
B
Long Range Antiferromagnetism (N=10)
i
iy
jx
ix
jijieff BJH )()()(
, ˆˆˆ
)()1()()1( jxx
jxx
pair correlation
G1,j =
Ji,j 1
|i-j|1.1
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Frustration and energy gaps
Short range: exponent 1.5
Long range: exponent 0.5
Ground state Neel ordered:
Abandoning adiabaticity probes frustration
Low-lying energy states in antiferromagnetic model
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StructureFunction
||
||),(1
ji
jiikejiGN
Spatial frequency k (2p)
Short range
Long range
R. Islam et al., Science340, 583 (2013)
Frustration of Magnetic Order (N=10)
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Antiferromagnetic Néel order of N=10 spinsAll in state
2600 runs, a=1.12
AFM ground state order 222 events
441 events out of 2600 = 17% Prob of any state at random =2 x (1/210) = 0.2%
219 events
R. Islam et al., Science340, 583 (2013)
All in state
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First Excited States(Pop. ~2% each)
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Second Excited States(Pop. ~1% each)
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Distribution of all 210 = 1024 states
Prob
abili
ty
0 341 682 1023
NominalAFMstate
B << J0
0101010101 1010101010
Prob
abili
ty
0.10
0.08
0.06
0.04
0.02
Initialparamagnetic
state
B >> J0
R. Islam et al., Science340, 583 (2013)
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Distribution of states ordered by energy (N=10)
Energy/J0R. Islam et al., Science
340, 583 (2013)
a = 1.12a = 0.86
ji
JJ ji
0
,Thermalization??
Cum
uliti
ve P
rob
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AFM order of N=14 spins (16,384 configurations)
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i
ixx
i
iyy
jx
ix
ji
jix BtBJH )()()()(, ˆˆ)(ˆˆ
==
At By = 0:
AFM Ising with AXIAL field
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AFM Ising with AXIAL field
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010010
AFM Ising with AXIAL field
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010010
AFM Ground States
2-Bright Ground State
1-Bright Ground States
0-Bright Ground State
P. Richerme, et al., ArXiv 1303.6983 (2013)
AFM Ising with AXIAL field
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0-Bright Ground State
1-Bright Ground States
2-Bright Ground States
3-Bright Ground States
4-Bright Ground States
5-Bright (AFM) Ground States
System exhibits a completedevil's staircase for N → ∞
P. Bak and R. Bruinsma, PRL 49, 249 (1982) P. Richerme, et al., ArXiv 1303.6983 (2013)
AFM Ising with AXIAL field
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Modulate transverse B field to drive transitions
between ground and excited states
i
iyy
jx
ix
ji
jixeff tBJH )()()(, ˆ)(ˆˆ
timeBy
Jxi,j
ampl
itude
Dynamics: many-body spectroscopy
C. Senko et. al., in preparation
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timeBy
Jxi,j
ampl
itude
Start from
Drive to
N = 6 Dynamics: many-body spectroscopy
C. Senko et. al., in preparation
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Start from
Drive to
N = 5
timeBy
Jxi,j
ampl
itude
Dynamics: many-body spectroscopy
C. Senko et. al., in preparation
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Start from
Drive to
N = 5 Dynamics: many-body spectroscopy
C. Senko et. al., in preparation
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N = 5
Modulation frequency (kHz)
Measurement
Theory
Spin states in order of energy
Dynamics: many-body spectroscopy
Complete spectrum of 5 spins
C. Senko et. al., in preparation
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111111111110011111111111
111111111101101111111111
111111111011110111111111
111111110111111011111111
111111101111111101111111
111111011111111110111111
C. Senko et. al., in preparation
Dynamics: many-body spectroscopyN = 12
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Modulation frequency (kHz)
Measurement
Theory
111111111110011111111111
111111111101101111111111
111111110111111011111111
111111101111111101111111
C. Senko et. al., in preparation
Dynamics: many-body spectroscopyN = 12
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FM
Po
pu
lati
on
+ +
+ +
+Y =
Drive system with all frequencies simultaneously(and control relative phases)
Create equal superposition of single-spin flip states
(W state)
Dynamics: quantum engineering (FM: N=4)
C. Senko et. al., in preparation
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)sin()( 11 tAtBy )sin( 22 tA
timeBy
Jxi,j
ampl
itude
+ ++Y =
2222
21 zyxxbipartite JJ
NJJNW
entangled
f = 340°
f = 160°
Dynamics: quantum engineering (FM: N=4)
C. Senko et. al., in preparation
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ji
JJ ji
0
,
“Ising Quench”(a) Prepare (↓+↑)N “kT = ”(b) Meaure correlations Cmidpoint, j (t)
Dynamics: “light cone” of interaction propagationwith long range interactions
Theory: Z. Gong and A. Gorshkov (JQI)
a=2.5N=41 N=41 N=41 a=1.5 a=0.5
N=11 J0=0.5kHz a=0.81
shorter rangelonger range
N=11 J0=0.5kHz a=1.3
neutrals (nearest-neighbor interactions): M. Cheneau et al., Nature 481, 484 (2012)
E.H. Lieb and D.W. Robinson, “The finite group velocity of quantum spin systems,” Commun. Math. Phys. 28, 251–257 (1972).
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Dynamics: L-R bounds with long range interactions
PreliminaryData
N=11 spins
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• Formation of localized defects: nonequilibrium dynamicsM. Knap, E. Demler, I. Bloch (in preparation)
• XY model
• Spin-1: topological excitations
• Programmable fully connected spin network
Up next…
N beams, each with N spectral components
:ˆˆ )()(, jx
ix
ji
jiJH
2
)1( NNinteractions
S. Korenblit, et al., New. J. Phys. 14, 095024 (2012)
i
i
ji
jy
iy
jiy
jx
ix
jixeff BJJH )()()(,)()(, ˆˆˆˆ
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Example: programming a 2D kagome lattice with a linear chain of 36 ions
atom # spectral component
Theory
J. Garcia-Ripoll et al., Phys. Rev. A 71, 062309 (2005)S. Korenblit et al., ArXiv 12010776 (2012)
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• GET MORE SPINS!!
B/J = 0.01B/J = 5
16 spin AFM simulation 18 spin FM simulation
mx = total spin along x
Prob
abili
ty
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N=16 ()
N=1
N=0 ()
Photon count histograms for N=16 ions
# photons
Global Spin Detection: 16 ions
N=8
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Quantum simulation with N=16 ions
B>>J
B ~ J
B << J
Ferro couplings
Quantum Phase
Transition
Decreasing B/J
FM/AFM order
paramagnetic polarization
Anti-ferro couplings
G(1
,j)G
(1,j)
Distance from 1st ion, j
B ~ J
B << J
N=16 ()
N=0 ()
Theoretical photon count histograms
# photons
N=8
B>>J
Ferro couplings
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~few 100Be+ ions ina Penning Trap
J. Britton et al., Nature 484, 489 (2012)
QuantumHard-drive?
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Going Cold: N>50
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GaTech Res. Inst.Al/Si/SiO2
Maryland/LPSGaAs/AlGaAs
Sandia Nat’l Lab: Si/SiO2
NIST-BoulderAu/Quartz
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a (C.O.M.)
b (stretch)
c (Egyptian)
d (stretch-2)
Mode competition – example: axial modes, N = 4 ions
Fluo
resc
ence
cou
nts
Raman Detuning dR (MHz)
-15 -10 -5 0 5 10 15
20
40
60
a b
c
d
a
bcd
2a
c-a
b-a
2b,a
+c b+
c
a+b
2a
c-a
b-a
2b,a
+c
b+c
a+b
carrier
axial modes only
modeamplitudes
cooling beam
D. Kielpinski, CM, D. Wineland, Nature 417, 709 (2002)
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Large scale vision (103 – 106 atomic qubits?)
• New hierarchical and modular quantum computer architecture• Different model for circuit optimization• Error correction thresholds exist! (R. Raussendorf)
C.M., et al., ArXiv 1208.0391 (2012).
0.001 Hz then, ~1 Hz now, ~1 kHz soon
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ENIAC (1946) Solid-state transistor (1947)
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right idea, wrong platform