dephasing and decoherence of neutron matter waves · connection de broglie schrödinger &...
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Wave-Particle PropertiesBasics of Neutron InterferometryDephasing and decoherenceGeometric phaseUnavoidable quantum losses Quantum Contextuality and Kochen-SpeckerLarmor and Compton frequency effectsRésumé
Helmut Rauch
Atominstitut, TU-Wien, Austria, EU
Dephasing
and decoherence
of neutron
matter waves
Dephasing
and decoherence
of neutron
matter waves
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CONNECTION
de Broglie
Schrödinger
& boundary conditions
H(
r ,t) i (
r ,t)
t
Wave PropertiesParticle Properties
m = 1.674928 (1) x 10-27 kg
s = 12
= - 9.6491783(18 ) x 10-27 J/T
= 887(2) s
R = 0.7 fm
= 12.0 (2 .5) x10-4 fm3
u - d - d - quark structure
m ... m ass, s ... spin, ... m agnetic m om ent, c ... C om pton w avelength, B ... ... -decay lifetim e, R ... (m agnetic) confine- deBroglie w avelength, c ... m ent radius, ... electric polarizability; all other -B ________________ coherence length, p ... packet m easured quantities like electric charge, m agnetic tw o level system length, d ... decay length, k.… m onopole and electric dipole m om ent are com - m om entum w idth, t ... chopper
patible w ith zero B ________________ opening tim e, v ... group velocity, … … phase.
ch
m.c = 1.319695 (20) x 10-15 m
For thermal neutrons= 1.8 Å, 2200 m/s
Bh
m. v
Bh
m.v = 1.8 x 10-10 m
c1
2 k
10-8 m
p v t . 10-2 m
d v . 1.942(5) x 106 m
0 2 (4)
The NeutronThe Neutron
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•
Neutron interferometry•
Neutron interferometry
The New Yorker Collection, Ch. Adams 1940
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effeffceff
2II0
I00
DkkDNbkD)n1(sdk
cosBAI
Neutron InterferometryNeutron Interferometry
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Quantum skierQuantum skier
Interferometer experiment
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Interferometer familyInterferometer family
I0
= c| trr
+ rrt
|2
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Interferometer set-up S18
Interferometer set-up S18
Instutut
Laue-Langevin, Grenoble
reactor
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16000
14000
12000
10000
8000
6000
4000
2000
0
inte
nsity
(cou
nts/
10s)
-800 -700 -600 -500 -400 -300 -200 -100 0 100 200 300 400 500 600ΔD / µm
D:DATA:Cycle 155:ifm30:adjust:nosample_3_wide.dat H beam O beam
High order interferencesHigh order interferences
0 10 20-10-20-30Δ[Å]
λ
= 1.92(2) Å
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Individual eventsIndividual events
H. Rauch, J. Summhammer, M. Zawisky, E. Jericha, Phys.Rev. A42 (1990) 3726
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II I iHt I i Bt
I i Bt I i
e e
e e
/ /
/ /
2
angleLarmor...v
B2gBtBt2
Theory: H.J.Bernstein, Phys.Rev.Lett. 18(1967)1102, Y.Aharonov, L.Susskind, Phys.Rev. 158(1967)1237
( )
( )
( )
/
/
e
e
I
I
2 0
20
0
0
( ) ( )( ) ( )2 04 0
2cos1
2)0(I)()0(I 02I
0I00
Experiment: H.Rauch, A.Zeilinger, G.Badurek, A.Wilfing, W.Bauspiess, U.Bonse, Phys.Lett. 54A(1975)425S.A.Werner, R.Colella, A.W.Overhauser, C.F.Eagen, Phys.Rev.Lett. 35(1975)1053A.G.Klein, G.I.Opat, Phys.Rev. D11(1976)523E.Klempt, Phys.Rev. D13(1975)3125M.E.Stoll, E.K.Wolff, M.Mehring, Phys.Rev. A17(1978)1561
B
n
Spinor SymmetrySpinor Symmetry
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4π-symmetry
ijjizyx
yxzxzyzx iii
1222
1001
00
0110
zyx ii
),,( zyx
bxaibaba ...
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h/sinAm4h/Agmm2
sinqsinq-anglecolatude...
beamscoherent by the enclosed area ...A
Ahm4sin
hAgmm2rdrmrdk
gt31tg
21tvrr
prL
VLgzmm2pL
rMm
Gm2pH
i2
gi
sgrav
i02gi
i
3200
0gi
2g
i
2
GRAVITATION
•
EXPERIMENT:•
Colella, Overhauseer,Werner, 1975
•
Werner, Staudenmann, Collela, Overhauser, 1975, 1978
•
Bonse & Wroblewski
1983
•
Atwood, Shull, Arthur 1984
•
THEORY:•
Page 1975;•
Anandan
1977•
Stodolsky
1979 •
Audretsch
& Lommerzahl
1982
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COW-Experiment (Colella, Overhauser, Werner)
Eokom
km
mgH
2 2
2
2 2
2( )
k k kom gH
ko ( ) sin
2
2
cow II I k S
cowm
hgAo 2
2
2 sin
R. Colella, A.W. Overhauser, S.A. Werner, Phys.Rev.Lett. 34 (1974) 1472
E0
= 20 meV; mgH
~ 1.003 neV
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Earth Rotation EffectEarth Rotation Effect
J.L.Staudenmann, S.A.Werner, R.Colella, A.W.Overhauser, PR/A21(1980)1419
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State presentationsState presentationsSchrödinger Equation:
t)t,r(i)t,r()t,r(V)t,r(
m2
2
Wave Function (Eigenvalue solution in free space):
kde)t,k()2()t,r( 3)trk(i2/3
Spatial distribution: Momentum distribution:2)t,r()t,r(
2)t,k()t,k(g
Coherence Function:
;'rr
'ttStationary situation: :)0(
kde)k(g)2()()0()( 3rki2/3
and others (Wigner function etc.)
Partial waves fill the whole space
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SPATIAL VERSUS MOMENTUM MODULATIONSPATIAL VERSUS MOMENTUM MODULATION
Momentum distribution
Spatial distribution
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3500
3000
2500
2000
1500
1000
500
inte
nsity
[cou
nts/
360s
]
2.742.722.70wavelength [Å]
1 = 0 Å 1 = 490 Å
1.0
0.8
0.6
0.4
0.2
0.0norm
aliz
ed c
oher
ence
func
tion
80060040020002 [Å]
1 = 0 Å 1 = 490 Å
M.Baron, H.Rauch, M.Suda, J.Opt.B5 (2003) S341
Wave packet structureWave packet structure
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Decoherence versus
Dephasing
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20
10
0
-10
-20
B [G
]
0.60.50.40.30.20.10.0
T [s]
800
600
400
200
0
Anza
hl p
ro 0
.2G
-20 -10 0 10 20
B [G]
Magnetic noise fieldsMagnetic noise fields
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Dephasing at low order
20000
15000
10000
5000
0
Inte
nsity
(cou
nts/
10s)
-100 0 100D (m)
H-Beam + B = 9G O-Beam + B = 9G
20000
15000
10000
5000
0
Inte
nsity
(cou
nts/
10s)
-100 0 100D (m)
H-Beam + B = 9G O-Beam + B = 9G
20000
15000
10000
5000
0
Inte
nsity
(cou
nts/
10s)
-100 0 100D (m)
H-Beam + B = 9G O-Beam + B = 9G
Magnetic noise fields
M.Baron, H.Rauch, M.Suda, J.Opt.B5 (2003) S244
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3500
3000
2500
2000
1500
1000
500
inte
nsity
[cou
nts/
360s
]
2.742.722.70wavelength [Å]
1 = 0 Å 1 = 490 Å
1.0
0.8
0.6
0.4
0.2
0.0norm
aliz
ed c
oher
ence
func
tion
80060040020002 [Å]
1 = 0 Å 1 = 490 Å
M.Baron, H.Rauch, M.Suda, J.Opt.B5 (2003) S341
Wave Packet StructureWave Packet Structure
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Dephasing
at high order
G.Sulyok
Y. Hasegawa, J. Klepp., H.Lemmel, H.Rauch, Phys.Rev. A81 (2010) 053609
2
22
21
21
21
eeeC vBlBt
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Mono- and multi-mode noise
N
iiii tBtB
1)cos()(
),(),(ˆ2
),(),( 22
trtrBmktrH
ttri
zLxxtBBtrB ˆ))()().((),( 0
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On-resonance→ single
photon
exchange
lvB n
21
02 Br
H.Weinfurter, G.Badurek, H.Rauch, D.Schwahn, Z.Phys. B72(1988)195
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Off-resonance
→ Multi-photon
exchange
tB
BtB
cos0)(
1
0
f jj
j ja z b z
[ ]
ωj
= ω0
+ j ω
a J Bj j ( ) 1
sin( / )2
I z e a z b z eif j j
ij t
j
22
1 (
B t
B B t( )
cos
00
0 1
B1
=62.8G
ω/2π=7534 Hz
)cos(2 tja j
j
jj
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Multi-photon exchange: results
(parallel fields)
J.Summhammer, K.A.Hamacher, H.Kaiser, H.Weinfurter, D.L.Jacobson, S.A.Werner, Phys.Rev.Lett.75(1995)3206 et al. PRL 75 (1995) 3206
ν
= 7534 Hz → ΔE= 3.24.10-11eV
<< ΔEbeam
= 10-4eV
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Formalism zLxxtBBtrB ˆ))()().((),( 0
N
iiii tBtB
1)cos()(
ti
n
xiknNnnIII
nn
NeeeJJtx
)()........(),( 11
),.........(),........(),........(),.........(2
sin22
22
1111
0
0220
20
NNNN
i
ii
iii
iii
nn
nnnvLT
BTT
nmBmkkn
0
)(2
0 ........Re1).(),(21).(
1
vx
with
eJJetxetxtxI
iii
n
tninn
iIII
iI
i
N
m
m
timm
fexctxI )(),(0
evenn
mnn
niNnnmm
ii
f
NeJJc
;10 cos)().......(
1
mT
im
M
ii dttI
TtI
MI
00
100 )(1)(1
),(),(ˆ2
),(),( 22
trtrBmktrH
ttri
dttT
CmT N
iiii
m
0 1cos1
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Multi-frequency
photon
exchange
ω1
= 1 kHz, B1
= 40 G ω1
= 2 kHz; ω2
= 3 kHz;
B1
= 15 G; B2
= 14.2 G
G. Sulyok, H. Lemmel, H. Rauch, Phys.Rev. A85 (2012) 033624
one
frequency two
frequencies
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ω 0 h f
0.0
0.4
0.81.0
0.0
0.2
0.40.0
0.2
0.4
0.0
0.2
0.40.0
0.2
0.4
0.0
0.2
0.4
0.0
0.2
0.4
0.0
0.2
0.4
0.0
0.2
0.4
0 5 10 15 0 5 10 15 0 5 10 15
magnetic field amplitude B1 [Gauss]
2 h 4 h
6 h 10 h 14 h
20 h 24 h 34 hFou
rier
co
effic
ien
ts |c
|
ω f
ω f
ω f
ω f
ω f ω f
ω f
ω f
n
f1
= 3kHz, f2
=5kHz, f3
=7kHz, f4
=11kHz, f5
=13kHz
Bi
= 4 G
Bi
= 11 G
G. Sulyok, H. Lemmel, H. Rauch, Phys.Rev. A85 (2012) 033624
Five-mode
caseFive-mode
case
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mT
im
M
ii dttI
TtI
MI
00
100 )(1)(1
0 20 40 60 800.0
0.2
0.4
0.6
0.8
1.0
upper frequency f [kHz]
dam
pin
g fa
cto
r k
measured valuessimulation with random phasessimulation with random phasesand random frequencies
up
30
25
20
15
10
5
0
ampl
itude
(a.
u.)
50403020100frequency (kHz)
30
25
20
15
10
5
0
ampl
itude
(a.
u.)
50403020100frequency (kHz)
800
600
400
200
0
Anza
hl p
ro 0
.2G
-20 -10 0 10 20
B [G]
Decoherence dephasing
Decoherence dephasing
dttT
CmT N
iiii
m
0 1cos1
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Robustness of the
geometric phase
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Berry-topological
phase
1
ttitRH
)(|)(|)(
))(()())(()(ˆ tRntEtRnRH n
))(()( )( tRnet ti
))(( tRn
))0(())(( RTR
)(||)())((
)(||)()(||)(1)0()(arg)(
0
0
RnRnRdidttRE
dttdtdtidtttTT
R
T
n
T
)0(|)0(|)(|
titi
eet
…. eigenstates of the instantaneous
HamiltonianΦ(t) ….. generalized
phase
for a closed
path:
for a constant
magnetic
field:
≐ 4π-symmetry
of spinors
dynamical
phase geometric
phase
2sin2cos
|2
sin|2
cos|
ie
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Berry Phase (adiabatic
& cyclic
evolution)
Non-adiabatic
evolution Non-adiabatic
& non-cyclic
evolution
[ Berry; Proc.R.S.Lond. A 392, 45 (1984)]
[Samuel & Bhandari, PRL 60, 2339 (1988)][Aharonov
& Anandan, PRL 58, 1593 (1987)
(for 2-level systems)Ω
Geometric PhasesGeometric Phases
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Variance
of geometric
phase
(g) tends
to 0 for increasing
time of evolution
in a magnetic
field.
G. De Chiara and G.M. Palma, PRL 91, 090404 (2003)R.S. Whitney, Y. Gefer, Phys.Rev.Lett. 90(2003)190402
Dephasing
-
DecoherenceDephasing
-
Decoherence
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Ultra-cold neutronsUltra-cold neutrons
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Ultra-cold neutrons at ILLUltra-cold neutrons at ILL
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S. Filipp, J. Klepp, Y. Hasegawa, Ch. Plonka, P. Geltenbort, U. Schmidt, H. Rauch, Phys.Rev.Lett.102 (2009) 030404
Experimental set-upExperimental set-up
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Compensation of the dynamical phaseCompensation of the dynamical phase
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Spin echo to cancel dynamical phase
constant B‐field strenght, but reverse path direction
+dynamic ‐dynamic +geometric +geometric
= 2x geometric phase
Ramsey experiment measures both geometric + dynamical phase
= dynamic + geometric phase
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Compensation in the case of noise fieldsCompensation in the case of noise fields
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F. Filipp, J. Klepp, Y. Hasegawa, Ch. Plonka, P. Geltenbort, U. Schmidt, H. Rauch, Phys.Rev.Lett.102 (2009) 030404
Rubustness
of the geometric phaseRubustness
of the geometric phase
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F. Filipp, J. Klepp, Y. Hasegawa, Ch. Plonka, P. Geltenbort, U. Schmidt, H. Rauch, Phys.Rev.Lett.102 (2009) 030404
Rubustness
of the geometric phaseRubustness
of the geometric phase
→ strength
ΔVΔτ → strength
ΔVΔτ
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Visualisation of the robustness of geometric phases
Visualisation of the robustness of geometric phases
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Dynamical
Phase ( ): dt
dGeometric
Phase ( ):
Stability calculations
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Unavoidable Quantum Losses
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Clothier
R., Kaiser H., Werner S.A., Rauch H., Woelwitsch
H., Phys.Rev.A44 (1991)5357
Phase echoPhase echo
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Source) (Detector
0
ie0
ie0
ji
rrkiij
i jijeae,
)(0
1,
)(0
ji
rrkiij
i jijebe
REVERSIBILITY-IRREVERSIBILITY
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0
1r
2r
3r
1t
2t
3t
0
0
and many
other
combinations…
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Barrier Reflectivity
δE T < 1
T + R = 1
RMin
= (V/2E)2δk2L2
> 0
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Overall phase
shift
(overall
thickness, potential height)
Exact
dimensions, varios
potentials,
beam
parameters
Parasitic (unavoidable) reflectionsParasitic (unavoidable) reflections
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• Quantum Contextuality
and
Kochen-Specker
phenomenon
• Quantum Contextuality
and
Kochen-Specker
phenomenon
Yuji Hasegawa
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EPR -
ExperimentEPR -
Experiment
sI II +1
-1
+1
-1
a b
Entanglement of two photon polarizations
= 12
I II + I II
Entanglement between Two-Particles
A. Einstein, B. Podolsky and N. Rosen, Phys. Rev. A. Einstein, B. Podolsky and N. Rosen, Phys. Rev. 4747
(1935) 777.(1935) 777.
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Two-particle versus
two-path entanglementTwo-particle versus
two-path entanglement
2-Particle Bell-State = 1
2 I II + I II
I, II represent 2-Particles
Measurement on each particle AI a = +1 P a;+1
I + –1 P a;–1I
BII b = +1 P b;+1II + –1 P b;–1
II
where P ;1 = 12 ei e–i
Then, AI, BII = 0
2-Space Bell-State = 1
2 s I p + s II p
s, p represent 2-Spaces, e.g., spin &
Measurement on each property As
= +1 Ps + –1 P+
s
Bp = +1 P
p + –1 P+p
where P = 12 + ei + e–i
Then, As, Bp = 0
==>> (Non-)Contextuality(In)Dependent Results for commuting Observables
-2 < S < 2
S = E(α1
,χ1
) -
E(α1
,χ2
) + E(α2
,χ1
) + E(α2
,χ2
)
Proposal: S.M. Roy, V. Singh, Phys.Rev. A48 (1993) 3379
S. Basu, S.Bandyopadhyay, G. Kar, D. Home, Phys.Lett. A279 (2001) 281
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Spin-observables
+z
-z
xs
ys
s
Path-observables
I
II
xp
yp
zp
p
Basis : +z
–z , Azimuthal angle : , Polar angle : s
Basis : I
II , Phase shift : , Relative intensity : p
zs
Spin-path (momentum) entanglementSpin-path (momentum) entanglement
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Contextuality ExperimentContextuality Experiment
.Y.Hasegawa, R.Loidl, G.Badurek, M.Baron, H.Rauch, Nature 425 (2003) 45 and Phys.Rev.Lett.97 (2006) 230401
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Manipulation of twoManipulation of two--subspacessubspaces
(a) Path(a) Path (b) Spin(b) Spin
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Violation of a BellViolation of a Bell--like inequalitylike inequality
E' , =
N'+ + , + N'+ + +,+ – N'+ + ,+ – N'+ + +,N'+ + , + N'+ + +,+ + N'+ + ,+ + N'+ + +,
where N'+ + , = P
sP
p
E' 1,1 = 0.542 0.007E' 1,2 = 0.488 0.012E' 2,1 = – 0.538 0.006E' 2,2 = 0.483 0.012
where
1 = 02 = 0.501 = 0.792 = 1.29
===>>> S' E' 1,1 + E' 1,2 – E' 2,1 + E' 2,2
= 2.051 0.019 > 2
Cf. Max. violaion: SCf. Max. violaion: S’’=2.81>2=2.81>2
More
recent
result:
S = 2.291±0.008
H. Bartosik, J. Klepp, C. Schmitzer, S. Sponar, A. Cabello, H. Rauch, Y. Hasegawa, Phys.Rev.Lett. 103 (2009) 040403
Y.Hasegawa, R.Loidl, G.Badurek, M.Baron, H.Rauch,
Nature 425 (2003) 45 and Phys.Rev.Lett.97 (2006) 230401
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measurement,s p s px x y y
measurements p s px y y x
H. Bartosik, J. Klepp, C. Schmitzer, S. Sponar, A. Cabello, H. Rauch, Y. Hasegawa, Phys.Rev.Lett. 103 (2009) 040403
Results of the Cabello ExperimentResults of the Cabello ExperimentResults of the Cabello Experiment
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Set-up for Peres-Mermin proofSet-up for Peres-Mermin proof
H. Bartosik, J. Klepp, C. Schmitzer, S. Sponar, A. Cabello, H. Rauch, Y. Hasegawa, Phys. Rev. Lett. 103 (2009) 040403
S=2.291±0.008.
1]..[ px
sy
py
sx
py
sy
px
sx
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Triple entangled states (GHZ-states)
Triple entangled states (GHZ-states)
H =H
spin
H path
H energy
Kochen-SpeckerKochen-Specker
S. Kochen, E. Specker, J.Math.Mech. 17 (1967) 59
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I 0
II 0
Neutron ( )
( )
:where :
:
i i ir
c
L
r
E
e e e E
N b D phase shiftert spin rotator
t zero field precession
Triply
entangled
statesTriply
entangled
states
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Mermin's inequality for GHZ-state2 according to
where
In contrast quantum theory predicts4
NC
p s e p s ex x x x y y
p s e p s ey x y y y x
Quantum GHZ
M non contextual theory
M E E
E E
M for
I 0
II 0
I 0
II 0
Neutron's GHZ-state
( )
( )
Relative phases are manipulated:
( )
( )
:where :
:
GHZ
r
Neutron
i i ir
c
L
r
E
E
E
e e e E
N b D phase shiftert spin rotator
t zero field precession
Phase shifter ( )
Spin rotator ( )
Zero field precession ( )
Mermin`s
Inequality
for GHZ-like
StatesMermin`s
Inequality
for GHZ-like
StatesD. Mermin, Phys.Rev.Lett. 65 (1990) 1838
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Phase shifter ( )
Spin rotator ( )
Zero field precession ( )
I 0
II 0
Neutron ( )
( )i i ir
E
e e e E
:where :
:
c
L
r
N b D phase shiftert spinrotator
t zero field precession
Mermin`s
Inequality: MeasurementsMermin`s
Inequality: Measurements
Y. Hasegawa, R. Loidl, G. Badurek S. Sponar, H. Rauch, Phys.Rev.Lett. 103 (2009) 040403
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Mermin's inequality for tri-GHZ-state2 according to
where
In contrast quantum theory predicts4
NC
p s e p s ex x x x y y
p s e p s ey x y y y x
Quantum GHZ
M non contextual theory
M E E
E E
M for
We obtained the values:
0.659
0.603
0.632
0.664
Finally, 2.558 0.004 2
p s ex x x
p s ex y y
p s ey x y
p s ey y x
Measured
E
E
E
E
M
Phase shifter ( )
Spin rotator ( )
Zero field precession ( )
Mermin`s
Inequality: ResultsMermin`s
Inequality: Results
Y. Hasegawa, R. Loidl, G. Badurek, K. Durstberger-Rennhofer, S. Sponar, H. Rauch, Phys.Rev.A…. (2010) 002100
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Uni. Innsbruck and IQO Innsbruck
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Compton frequency
as an internal clock ?initiated
by: H. Müller, A. Peters, S. Chu, Nature 463 (2010) 926
hmcc
cc
2
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static: time dependent:
F. Mezei, Z. Physik 255 (1972) 146R. Gähler, Golub, J.Phys. France 49 (1988) 1195
MHzB
L 12 0
Larmor
interferometryLarmor
interferometry
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COW-Experiment (Colella, Overhauser, Werner)
Eokom
km
mgH
2 2
2
2 2
2( )
k k kom gH
ko ( ) sin
2
2
cow II I k S
cowm
hgAo 2
2
2 sin
R. Colella, A.W. Overhauser, S.A. Werner, Phys.Rev.Lett. 34 (1974) 1472
E0
= 20 meV; mgH
~ 1.003 neV
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mchC
Peters A., Chung
K.Y., Chu
S. Nature 400 (1999) 849
Müller H., Peters A., Chu
S. Nature 463 (2010) 926
Collela
R., Overhauser
A.W., Werner S.A. Phys.Rev.Lett. 34 (1975) 1053
HzmcC
252
10
Use of Compton FrequencyUse of Compton Frequency
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Gravity
phase
shift
sin2 02
2
02
2
gAhm
vLmgH
mcUmc
)/1( 20 mcU
ddmc C 21
)( mgHU
zrrandrGMg
czmmgz
rGMmmcLgr
2
222
/
121
Schwarzschild metric
for motion
zrrandrGMg
zmmgzr
GMmLcl
2
2
/
21
classical
motion
Müller H., Peters A., Chu
S. Nature 463 (2010) 926
debate
with: Wolf P., Blanchhet
L., Borde C.J., Raynaud
S., Salomon C., Cohen-Tannoudji, Class.Quantum
Grav. 28 (2011) 145017
sin2
22
.
02
2
20
222
gAhm
mkmgz
mk
dsk
Was a hidden
variableand is
it
still ?
c
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)/(0
tExkie
21
222 1,
cvtvxmcEmvk
/0
/)1/(/).(0
22222 imctcvimctmctvmvi eee
tcvtc
vt2
22
2
211
Motion in free
space:
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Motion within
a potential U ( = gh)
dtmUmvtmc
gcUg
dtcv
cUmcdxdxgmcdmc
nr
ii
21
121
21
22
200
2
2
2
222
d gdxdx NR (1U / c2 12 v2 / c2 )dt,
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From our experiments we can conclude or at least we can strongly believe:
• There is no well defined natural limit between quantum and classical world.
• Non-locality (in ordinary space) and contextuality are fundamental properties of nature.
• Quantum mechanics gives a correct description of all results but boundary conditions are as important as the basic equation itself.
• Quantum losses are unavoidable and occure in any kind of interaction.
From our experiments we can conclude or at least we can strongly believe:
• There is no well defined natural limit between quantum and classical world.
• Non-locality (in ordinary space) and contextuality are fundamental properties of nature.
• Quantum mechanics gives a correct description of all results but boundary conditions are as important as the basic equation itself.
• Quantum losses are unavoidable and occure in any kind of interaction.
RésuméRésumé
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• For the interpretation one should keep in mind that the initial or boundary conditions are also based on statistical measurements of an equally prepared ensemble and, therefore, it does not seem so surprising that only statistical predictions about the outcome of an experiment can be made.
• Thus, we do not know everything at the beginning so we also do not know everything at the end (e.g. every event).
(S. Stenholm 2009).
• For the interpretation one should keep in mind that the initial or boundary conditions are also based on statistical measurements of an equally prepared ensemble and, therefore, it does not seem so surprising that only statistical predictions about the outcome of an experiment can be made.
• Thus, we do not know everything at the beginning so we also do not know everything at the end (e.g. every event).
(S. Stenholm 2009).
Résumé addRésumé add
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• Entanglement, quantum contextuality and Kochen- Specker phenomena tell us that quantum physics involves stronger correlations than classical physics does. The quantum world seems not to be chaotic but provides the basis for the stability of atoms, molecules and – last but not least- for the existence of conscious beings.
(G. Eder 2000)
• Entanglement, quantum contextuality and Kochen- Specker phenomena tell us that quantum physics involves stronger correlations than classical physics does. The quantum world seems not to be chaotic but provides the basis for the stability of atoms, molecules and – last but not least- for the existence of conscious beings.
(G. Eder 2000)
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Neutron interferometry generations
Stefan Filipp
Rudolf LoidlMatthias
Baron
YujiHasegawa
Anton Zeilinger
Martin Suda
Erwin Seidl
UlrichBonse
Hartmut Lemmel
DietmarPetraschek
KatharinaDurstberger
MichaelZawisky
Wolfgang Treimer
Sam Werner
Jürgen Klepp
Gerald Badurek
Stefan Sponar