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Funded by Hosted by
Phase shift of a weak coherent beam
by a single atom
Thanks to
Chen Zilong
Florian Huber
Lee Jianwei
Timothy Liew
Valerio Scarani
Syed Abdullah Aljunid, Gleb Maslennikov, Tey Meng Khoon,
Brenda Chng, Christian Kurtsiefer
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Brief Outline
• Motivation for the experiment
• Theoretical description
• Experiment and Results
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Motivation
• Quantify interaction of a two-level atom with
light
• Strong interaction without a cavity.
Tey M.K. et al. Nature Physics 4, 924 - 927 (Dec 2008)
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Scattering Ratio
in
scatscat
P
PR
Quantifying Interaction
Pscat
PscatPscat
Pscat
Pin
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Scattering Ratio
Transmission
Phase shift
2
in
2
out EET
)arg( inout
EE
in
scatscat
P
PR
Quantifying Interaction
2
outE2
inE
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Weak excitation, and on-resonant input light
Atom-Light Interaction
scatinout EEE
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Weak excitation, and on-resonant input light
Atom-Light Interaction
i
iRE
221 scat
in(On axis)natural linewidth
detuning
scatinout EEE
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Strong Interaction
G. Zumofen, et. al.,
Phys. Rev. Lett. 101, 180404 (2008)
M. K. Tey, et. al.
New J. Phys. 11 (2009) 043011
CClosed expression for focused
Gaussian beam
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Strong Interaction
G. Zumofen, et. al.,
Phys. Rev. Lett. 101, 180404 (2008)
M. K. Tey, et. al.
New J. Phys. 11 (2009) 043011
CClosed expression for focused
Gaussian beam
0.84
2.30.16
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Experimental Setup
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Experimental Setup
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Experimental Setup
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Experimental Setup
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Experimental Setup
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Experimental Setup
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Experimental Setup
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Experimental Setup
probe2.5 cm
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Phase Measurement
Mach-Zehnder interferometer.
dc
dc
PP
PParccos
1~~
2
~~
arccos'
''
''
dc
dc
II
IIc
d
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Phase Measurement
Mach-Zehnder interferometer.
TPP
PP
dc
dc ''arccos'
dc
dc
PP
PParccos
'
1~~
2
~~
arccos'
''
''
dc
dc
II
IIc
d
1
)(2; ''
dc
dc
PP
PPT
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Results
Transmission of
(93.9 ± 0.2)%
Max phase shift of
(0.9 ± 0.2) ° at~Γ/2
Rscat = 0.062 ± 0.003
= (8.6± 0.4)MHz
Theoretical
Transmission: 84%
max phase shift: 2.3°
22
2
scat22
2
in
2
out
4
214
R
E
ET
scatscat22
inout2
14arg)arg( iRR
EE
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Conclusion
• Strong interaction of light with a single atom
can be observed by simple focusing.
• 0.9° phase shift of a weak coherent beam
observed together with 93.9% transmission.
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Conclusion
• Strong interaction of light with a single atom
can be observed by simple focusing.
• 0.9° phase shift of a weak coherent beam
observed together with 93.9% transmission.
Thank You & The End
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Antibunching in single atom fluorescence
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Dipole trap laser wavelength: 980 nm
trapping
potential