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Abstract

The method by measuring one photon of an entangled two-photon pair to simultaneously herald another photon as the single photon, is one of the important ways to prepare the desired single-photon source. However, achieving high herald efficiency is still an open problem. In this paper, with the polarization entangled photon pairs generated by the parametric down-conversion process in the I-type phase-matched BBO ( β-BaB ₂O ₄) nonlinear crystal, we investigate how the herald efficiency of the single-photon along the ideal path depends on the selection of the heralded basis of the photon in the signal path. An extended Hanbury-Brown-Twiss experimental system is built with a fiber polarizing beam splitter and three single-photon detectors, to experimentally measure the herald efficiency of the heralded single-photon source. Our results show that with the present polarization entangled-photon system whose quality is relatively low, the herald efficiency with the $|+/-\rangle$ heralded basis is enhanced 4% compared with that with the $|H/V\rangle$ heralded basis.

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Authors and contacts

Yang Hong-En¹,
Wei Lian-Fu^1,2

Corresponding author:Wei Lian-Fu,lfwei@swjtu.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 11974290, U1330201).

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References

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Cited By

DownLoad: Full-Size Img PowerPoint

延时/ns	0	5	10	15	20	25	30	35	40	45	50
符合计数	7905	8043	6369	6379	6351	6349	6377	6328	6322	6339	6318

DownLoad: CSV

符合通道	$N_{13}$	$N_{23}$	$N_{123}$
$\|H\rangle\|H\rangle$	583	607	111
$\|+\rangle\|+\rangle$	693	730	158

DownLoad: CSV

信号光路偏振状态	信号光路光子计数率	闲置光场所处的偏振态	符合计数
$\|H\rangle$	6859	$\|H\rangle$	1142
$\|H\rangle$	6859	$\|V\rangle$	54
$\|V\rangle$	6945	$\|V\rangle$	1137
$\|V\rangle$	6945	$\|H\rangle$	39
$\|+\rangle$	7492	$\|+\rangle$	1416
$\|+\rangle$	7492	$\|-\rangle$	12
$\|-\rangle$	6277	$\|-\rangle$	1178
$\|-\rangle$	6277	$\|+\rangle$	15

DownLoad: CSV

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Catalog

Vol. 68, Issue 23 - 2019-12-05

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信号光路偏振状态	信号光路光子计数率	闲置光场所处的偏振态	符合计数
$\|H\rangle$	6859	$\|H\rangle$	1142
$\|H\rangle$	6859	$\|V\rangle$	54
$\|V\rangle$	6945	$\|V\rangle$	1137
$\|V\rangle$	6945	$\|H\rangle$	39
$\|+\rangle$	7492	$\|+\rangle$	1416
$\|+\rangle$	7492	$\|-\rangle$	12
$\|-\rangle$	6277	$\|-\rangle$	1178
$\|-\rangle$	6277	$\|+\rangle$	15

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