Conditional production of superpositions of coherent states with inefficient photon detection

被引：174

作者：

Lund, AP ^{[1
]}

Jeong, H

Ralph, TC

Kim, MS

机构：

[1] Univ Queensland, Dept Phys, Ctr Quantum Comp Technol, St Lucia, Qld 4072, Australia

[2] Queens Univ Belfast, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland

来源：

PHYSICAL REVIEW A | 2004年 / 70卷 / 02期

基金：

澳大利亚研究理事会; 英国工程与自然科学研究理事会; 新加坡国家研究基金会;

关键词：

D O I：

10.1103/PhysRevA.70.020101

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

It is shown that a linear superposition of two macroscopically distinguishable optical coherent states can be generated using a single photon source and simple all-optical operations. Weak squeezing on a single photon, beam mixing with an auxiliary coherent state, and photon detecting with imperfect threshold detectors are enough to generate a coherent state superposition in a free propagating optical field with a large coherent amplitude (alpha>2) and high fidelity (F>0.99). In contrast to all previous schemes to generate such a state, our scheme does not need photon number resolving measurements nor Kerr-type nonlinear interactions. Furthermore, it is robust to detection inefficiency and exhibits some resilience to photon production inefficiency.

引用

页码：020101 / 1

页数：4

共 23 条

[1]

Boyd RW, 1999, J MOD OPTIC, V46, P367, DOI 10.1080/09500349908231277

[2] Observing the progressive decoherence of the ''meter'' in a quantum measurement [J].

Brune, M ;

Hagley, E ;

Dreyer, J ;

Maitre, X ;

Maali, A ;

Wunderlich, C ;

Raimond, JM ;

Haroche, S .

PHYSICAL REVIEW LETTERS, 1996, 77 (24) :4887-4890

[3] Lossy purification and detection of entangled coherent states -: art. no. 062303 [J].

Clausen, J ;

Knöll, L ;

Welsch, DG .

PHYSICAL REVIEW A, 2002, 66 (06) :12

[4] Macroscopically distinct quantum-superposition states as a bosonic code for amplitude damping [J].

Cochrane, PT ;

Milburn, GJ ;

Munro, WJ .

PHYSICAL REVIEW A, 1999, 59 (04) :2631-2634

[5]

Dakna M, 1997, PHYS REV A, V55, P3184, DOI 10.1103/PhysRevA.55.3184

[6]

GLANCY S, QUANTPH0311093, P53605

[7]

Jeong H, 2002, QUANTUM INF COMPUT, V2, P208

[8] Efficient quantum computation using coherent states [J].

Jeong, H ;

Kim, MS .

PHYSICAL REVIEW A, 2002, 65 (04) :6

[9] Quantum-information processing for a coherent superposition state via a mixed entangled coherent channel [J].

Jeong, H ;

Kim, MS ;

Lee, J .

PHYSICAL REVIEW A, 2001, 64 (05) :7

[10] Quantum state reconstruction of the single-photon Fock state [J].

Lvovsky, AI ;

Hansen, H ;

Aichele, T ;

Benson, O ;

Mlynek, J ;

Schiller, S .

PHYSICAL REVIEW LETTERS, 2001, 87 (05) :50402-1

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