Resilience of multiphoton entanglement under losses

被引：27
作者：
Durkin, GA [1 ]
Simon, C
Eisert, J
Bouwmeester, D
机构：
[1] Univ Oxford, Ctr Quantum Computat, Oxford OX1 3PU, England
[2] CNRS, Spectrometrie Phys Lab, F-38402 St Martin Dheres, France
[3] Univ Grenoble 1, F-38402 St Martin Dheres, France
[4] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA
[5] Univ Potsdam, Inst Phys, D-14469 Potsdam, Germany
来源：
PHYSICAL REVIEW A | 2004年 / 70卷 / 06期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1103/PhysRevA.70.062305
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We analyze the resilience under photon loss of the bipartite entanglement present in multiphoton states produced by parametric down-conversion. The quantification of the entanglement is made possible by a symmetry of the states that persists even under polarization-independent losses. We examine the approach of the states to the set of positive partial transpose states as losses increase, and calculate the relative entropy of entanglement. We find that some bipartite distillable entanglement persists for arbitrarily high losses.
引用
收藏
页码：062305 / 1
页数：5
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