New high-efficiency source of photon pairs for engineering quantum entanglement

We constructed an efficient source of photon pairs using a waveguide-type nonlinear device and performed a two-photon interference experiment with an unbalanced Michelson interferometer. As the interferometer has two arms of different lengths, photons from the short arm arrive at the detector earlie...

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Bibliographic Details
Published in:Physical review letters 2001-06, Vol.86 (24), p.5620-5623
Main Authors: Sanaka, K, Kawahara, K, Kuga, T
Format: Article
Language:English
Subjects:
INTERFEROMETERS
MICHELSON INTERFEROMETER
PHOTONS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
VISIBILITY
WINDOWS
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Summary:We constructed an efficient source of photon pairs using a waveguide-type nonlinear device and performed a two-photon interference experiment with an unbalanced Michelson interferometer. As the interferometer has two arms of different lengths, photons from the short arm arrive at the detector earlier than those from the long arm. We find that the arrival time difference (Delta L/c) and the time window of the coincidence counter (Delta T) are important parameters which determine the boundary between the classical and quantum regimes. Fringes of high visibility ( 80% +/- 10%) were observed when Delta T < Delta L/c. This result is explained only by quantum theory and is clear evidence for quantum entanglement of the interferometer's optical paths.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.86.5620