Transcript
Quantum
Ghost Imaging
BY WATHAN PRATUMWAN
Imaging
Bob
Alice
| β +| β
| β +| β
| β π΄| β π΅+| β π΄| β π΅
Entangled pair
βI cannot seriously believe in quantum
theory because it cannot be reconciled with
the idea that physics should represent a
reality in time and space, free from
spooky actions at a distance.β
β Albert Einstein
coincidence circuit
Laserpump
BBO
prism polarizingbeam splitter
lens
filteraperture
collection lens
filter
X-Y scanningfibre
D1
D2
Experiment
signal
idler
Result
Aperture
Coincident counts as a function of the fiber tipβs coordinates
BBO
beam splitter
lens
aperture
X-Y scanningfibre
1
π+1
πβ²=1
πGaussian thin lens
| Ξ¨ =
π ,π
πΏ ππ + ππ β ππ πΏ π€π + π€π β π€π | π€π β | π€π
Phase-matching wavefunction
Entangled state wavefunction
Two-photon geometrical optics
signal
idler
pump
BBO
π½π
π½π
πΌπ
πΌπ
ππ sin πΌπ = ππ sin πΌπ
ππ sin π½π = ππ sin π½πππ β ππ β ππ 2
Two-photon geometrical optics
signal
idler
π = 400 mm
π = 600 mm πβ² = 1200 mm
Two-photon geometrical optics
collectionlens
lensfiber
tip plane
BBO
D1
Summary The entanglement is nonlocal correlation of multi-particle system.
The ghost imaging experiment demonstrates the entanglement between a pair of photons.
Geometrical optics can apply to quantum optics.
βWe cannot make the mystery go
away by explaining how it works.
We will just tell you how it works.β
β Richard P. Feynman
ReferencesPittman, T., Shih, Y., Strekalov, D., & Sergienko, A. (1995). Optical imaging by
means of two-photon quantum entanglement. Physical Review A, 52(5),
R3429βR3432.
Shih, Y. (2008). The Physics of Ghost Imaging. Quantum Physics. Retrieved from
http://arxiv.org/abs/0805.1166
The End
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