共 21 条
Photon-bunching measurement after two 25-km-long optical fibers
被引:39
作者:
Halder, M
[1
]
Tanzilli, S
[1
]
de Riedmatten, H
[1
]
Beveratos, A
[1
]
Zbinden, H
[1
]
Gisin, N
[1
]
机构:
[1] Univ Geneva, Appl Phys Grp, CH-1211 Geneva, Switzerland
来源:
PHYSICAL REVIEW A
|
2005年
/
71卷
/
04期
关键词:
D O I:
10.1103/PhysRevA.71.042335
中图分类号:
O43 [光学];
学科分类号:
070207 ;
0803 ;
摘要:
To show the feasibility of a long-distance partial Bell-state measurement, a Hong-Ou-Mandel experiment with coherent photons is reported. Pairs of degenerate photons at telecommunication wavelength are created by parametric down-conversion in a periodically poled lithium niobate waveguide. The photon pairs are separated in a beam splitter and transmitted via two fibers of 25 km. The wave packets are relatively delayed and recombined on a second beam splitter, forming a large Mach-Zehnder interferometer. Coincidence counts between the photons at the two output modes are registered. The main challenge consists in the trade-off between low count rates due to narrow filtering and length fluctuations of the 25-km-long arms during the measurement. For balanced paths a Hong-Ou-Mandel dip with a net visibility of 47.3% is observed, which is close to the maximal theoretical value of 50% developed here. This proves the practicability of a long-distance Bell-state measurement with two independent sources, as, e.g., required in an entanglement swapping configuration in the scale of tens of kilometers.
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