Evaluation of polarization entanglement generated by pulsed spontaneous parametric down-conversion with multi-pairs using four single-photon detectors for quantum state tomography

被引：0

作者：

Yoshizawa, Akio ^{[1
]}

Fukuda, Daiji ^{[1
]}

Tsuchida, Hidemi ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

来源：

OPTICS COMMUNICATIONS | 2012年 / 285卷 / 16期

关键词：

Quantum state tomography; Fidelity; Entanglement; Spontaneous parametric down-conversion; Photon-number-resolving single-photon detector; Threshold single-photon detector; FIBER; QUALITY;

D O I：

10.1016/j.optcom.2012.04.017

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Quantum state tomography (QST) is widely used to evaluate entanglement generated by spontaneous parametric down-conversion. Two-fold coincidence counts for 16 different configurations have been measured using single-photon detectors to estimate the fidelity (i.e., the probability overlap between ideal and real states) from the reconstructed density matrix. However, multi-pair emission events degrade the fidelity. Here, we numerically analyze pulse-pumped polarization-entangled photon pairs for single-photon detectors that can or cannot count the number of incident photons to estimate the fidelity given by QST. Threshold single-photon detectors are desirable for QST from a practical point of view. Our analysis suggests that using four threshold single-photon detectors for two-fold coincidence measurements offers almost the same fidelity as that given by four photon-number-resolving single-photon detectors. The fidelity estimated by QST becomes poor and loss independent when two threshold single-photon detectors are used. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：3502 / 3506

页数：5

共 17 条

[1] Nonseparable Werner states in spontaneous parametric down-conversion [J].

Caminati, M ;

De Martini, F ;

Perris, R ;

Sciarrino, F ;

Secondi, V .

PHYSICAL REVIEW A, 2006, 73 (03)

[2] Titanium-based transition-edge photon number resolving detector with 98% detection efficiency with index-matched small-gap fiber coupling [J].

Fukuda, Daiji ;

Fujii, Go ;

Numata, Takayuki ;

Amemiya, Kuniaki ;

Yoshizawa, Akio ;

Tsuchida, Hidemi ;

Fujino, Hidetoshi ;

Ishii, Hiroyuki ;

Itatani, Taro ;

Inoue, Shuichiro ;

Zama, Tatsuya .

OPTICS EXPRESS, 2011, 19 (02) :870-875

[3] High-fidelity transmission of polarization encoded qubits from an entangled source over 100 km of fiber [J].

Huebel, Hannes ;

Vanner, Michael R. ;

Lederer, Thomas ;

Blauensteiner, Bibiane ;

Loruenser, Thomas ;

Poppe, Andreas ;

Zeilinger, Anton .

OPTICS EXPRESS, 2007, 15 (12) :7853-7862

[4] Measurement of qubits [J].

James, DFV ;

Kwiat, PG ;

Munro, WJ ;

White, AG .

PHYSICAL REVIEW A, 2001, 64 (05) :15-523121

[5] Pulsed Sagnac source of narrow-band polarization-entangled photons [J].

Kuzucu, Onur ;

Wong, Franco N. C. .

PHYSICAL REVIEW A, 2008, 77 (03)

[6] All-fiber photon-pair source for quantum communications: Improved generation of correlated photons [J].

Li, XY ;

Chen, J ;

Voss, P ;

Sharping, J ;

Kumar, P .

OPTICS EXPRESS, 2004, 12 (16) :3737-3744

[7] Stable source of high quality telecom-band polarization-entangled photon-pairs based on a single, pulse-pumped, short PPLN waveguide [J].

Lim, Han Chuen ;

Yoshizawa, Akio ;

Tsuchida, Hidemi ;

Kikuchi, Kazuro .

OPTICS EXPRESS, 2008, 16 (17) :12460-12468

[8] Distribution of polarization-entangled photon-pairs produced via spontaneous parametric down-conversion within a local-area fiber network: Theoretical model and experiment [J].

Lim, Han Chuen ;

Yoshizawa, Akio ;

Tsuchida, Hidemi ;

Kikuchi, Kazuro .

OPTICS EXPRESS, 2008, 16 (19) :14512-14523

[9]

Lita AE, 2008, OPT EXPRESS, V16, P3032, DOI 10.1364/OE.16.003032

[10] Distribution of time-bin entangled qubits over 50 km of optical fiber -: art. no. 180502 [J].

Marcikic, I ;

de Riedmatten, H ;

Tittel, W ;

Zbinden, H ;

Legré, M ;

Gisin, N .

PHYSICAL REVIEW LETTERS, 2004, 93 (18) :180502-1

← 1 2 →