Quantum entanglement of an entangled coherent state：Role of particle losses

We analyze entanglement properties of entangled coherent state （ECS）, ｜α,0） 1,2 ＋｜0,α） 1,2, with and without photon losses. By separating the coherent state into ]a） = co｜0） ＋ √-Co2｜α）, we derive exact results of the logarithmic negativity EN, which quantifies the degree of entanglement between the...

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Bibliographic Details
Published in:Chinese physics B 2014-03, Vol.23 (3), p.142-146
Main Author: 刘盼 冯晓敏 金光日
Format: Article
Language:English
Subjects:
Brackets
Coherence
ECS
Entanglement
Infinity
Optimization
Photons
Quantum mechanics
Radicals
二氧化碳
光子数
损失
粒子
纠缠特性
纠缠相干态
量子纠缠
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Summary:We analyze entanglement properties of entangled coherent state （ECS）, ｜α,0） 1,2 ＋｜0,α） 1,2, with and without photon losses. By separating the coherent state into ]a） = co｜0） ＋ √-Co2｜α）, we derive exact results of the logarithmic negativity EN, which quantifies the degree of entanglement between the two bosonic modes. Without particle losses, E~ = 1 for the NOON state; while for the ECS, E jr increases from 0 to 1 as ｜α｜-→∞. In the presence of photon losses, we find that the ECS with large enough photon number is more robust than that of the NOON state. An optimal ECS is obtained by maximizing E~ with respect to l a 12.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/23/3/030310