Enhancing entanglement of entangled coherent states by single-mode coherent superposition of photon subtraction and addition |
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Authors: | Li-Yun Hu Hao-Liang Zhang Yin-Quan Hu Zhi-Ming Zhang |
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Institution: | 1. Department of Physics, Jiangxi Normal University, Nanchang 330022, China;2. Laboratory of Nanophotonic Functional Materials and Devices, SIPSE & LQIT, South China Normal University, Guangzhou 510006, China |
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Abstract: | We introduce a new entangled quantum state generated by applying single-mode coherent superposition of photon subtraction and addition (a† cos θ + a sin θ)m to the entangled coherent state |Ψ±(α,0)〉, and then investigate the entanglement properties affected by coherent superposition operation. It is shown that this operation can be applied to enhance the entanglement of the state |Ψ+(α,0)〉. In addition, the effects of the coherent operation is better to improve the entanglement than that of the creation operation (a†m) for |Ψ+(α,0)〉 in a small-amplitude regime and for |Ψ−(α,0)〉 in any regime. |
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Keywords: | Entangled coherent states Coherent superposition Photon subtraction/addition Enhancing entanglement |
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