An efficient quantum filter for multiphoton states

被引：1
|
作者：
Lim, YL
Beige, A
机构：
[1] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2BZ, England
[2] Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge CB3 0WA, England
来源：
JOURNAL OF MODERN OPTICS | 2005年 / 52卷 / 08期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1080/09500340512331323493
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We propose a scheme for implementing a multipartite quantum filter that uses entangled photons as a resource. It is shown that the success probability for the 2-photon parity filter can be as high as 1/2, which is the highest that has so far been predicted without the help of universal two-qubit quantum gates. Furthermore, the required number of ancilla photons is the least of all current parity filter proposals. Remarkably, the quantum filter operates with probability 1/2 even in the N-photon case, irregardless of the number of photons in the input state.
引用
收藏
页码：1073 / 1080
页数：8
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