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

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