Entanglement-assisted scheme for nondemolition detection of the presence of a single photon

被引：21
作者：
Bula, Marek [1 ,2 ]
Bartkiewicz, Karol [1 ,2 ]
Cernoch, Antonin [3 ,4 ]
Lemr, Karel [1 ,2 ]
机构：
[1] Palacky Univ, Joint Lab Opt, Reg Ctr Adv Technol & Mat, 17 Listopadu 12, Olomouc 77207, Czech Republic
[2] Acad Sci Czech Republ, Inst Phys, Olomouc 77207, Czech Republic
[3] Palacky Univ, Joint Lab Opt, Inst Phys, Olomouc 77207, Czech Republic
[4] Acad Sci Czech Republ, Inst Phys, Olomouc 77207, Czech Republic
来源：
PHYSICAL REVIEW A | 2013年 / 87卷 / 03期
关键词：
QUANTUM COMPUTATION;
D O I：
10.1103/PhysRevA.87.033826
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this paper, we propose a resource-optimal linear-optical scheme for quantum nondemolition detection of single-photon presence. By measuring the state of ancillary photons, the presence of a photon in signal mode is revealed with a success probability of 1/2 without any disturbance to its state. We also show how to tune the setup to perform quantum nondemolition measurement of the signal photon state, and we provide a tradeoff between the extracted information and the signal state disturbance. Moreover, the optimality of resources and methods by which to increase the success probability are discussed. DOI: 10.1103/PhysRevA.87.033826
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页数：6
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