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Volumn 59, Issue 6, 1999, Pages 4150-4163

Long-distance Bell-type tests using energy-time entangled photons

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Indexed keywords


EID: 0001085312     PISSN: 10502947     EISSN: 10941622     Source Type: Journal    
DOI: 10.1103/PhysRevA.59.4150     Document Type: Article
Times cited : (124)

References (80)
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    • A first attempt to investigate nonlocality over large distances was reported in
    • A first attempt to investigate nonlocality over large distances was reported in 6. However, it contrasts with ours, as both analyzers were positioned next to the source, one connected with a 4.3 km fiber on a spool, while the other analyzer was directly connected to the source. Therefore, the physical distance between the two analyzers was of only a few meters.
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    • We would like to mention that postselecting only events leading to the central coincidence peak in order to create the entangled state [Eq. (3)] constitutes a fundamental loophole in these kinds of Bell-type tests
    • We would like to mention that postselecting only events leading to the central coincidence peak in order to create the entangled state [Eq. (3)] constitutes a fundamental loophole in these kinds of Bell-type tests.
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    • To avoid this inconvenience, one could use type-II phase matching and exploit the fact that, in this case, signal and idler photons are orthogonally polarized in order to separate all pairs
    • To avoid this inconvenience, one could use type-II phase matching and exploit the fact that, in this case, signal and idler photons are orthogonally polarized in order to separate all pairs.
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    • There might be an interesting effect caused by the interplay of chromatic-dispersion-caused coincidence peak broadening and a coincidence window that selects only a subensemble of the whole peak. To simplify the argument, we neglect the intrinsic detector time jitter for a moment. Then, maximal or minimal values in the coincidence-detection time spectrum can be caused only by wave trains lying at the upper or lower end of the photon spectrum. The effect of a small coincidence window is then somehow similar to the use of a spectral filter. However, since the detection time jitter is dominant in our case, this filtering should be very small
    • There might be an interesting effect caused by the interplay of chromatic-dispersion-caused coincidence peak broadening and a coincidence window that selects only a subensemble of the whole peak. To simplify the argument, we neglect the intrinsic detector time jitter for a moment. Then, maximal or minimal values in the coincidence-detection time spectrum can be caused only by wave trains lying at the upper or lower end of the photon spectrum. The effect of a small coincidence window is then somehow similar to the use of a spectral filter. However, since the detection time jitter is dominant in our case, this filtering should be very small.
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    • The coincidence window has been set to a small value in order to achieve a better ratio of detected to accidental coincidences (Formula presented). However, a violation of Bell inequalities could have been achieved with a three-times-larger window as well. Due to a lower (Formula presented), the raw visibility of the coincidence fringes would drop from (Formula presented) to around (Formula presented) and still violate Eq. (10)
    • The coincidence window has been set to a small value in order to achieve a better ratio of detected to accidental coincidences (Formula presented). However, a violation of Bell inequalities could have been achieved with a three-times-larger window as well. Due to a lower (Formula presented), the raw visibility of the coincidence fringes would drop from (Formula presented) to around (Formula presented) and still violate Eq. (10).
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    • Unequal path-length differences in both interferometers (Formula presented) increase the possibility of differentiating between the long-long and short-short paths (by looking at the differences in photon arrival time), hence decreasing the visibility
    • Unequal path-length differences in both interferometers (Formula presented) increase the possibility of differentiating between the long-long and short-short paths (by looking at the differences in photon arrival time), hence decreasing the visibility.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.