Improving entanglement of even entangled coherent states by a coherent superposition of photon subtraction and addition

2014/11/20 by Shiyou Liu, Jie‐Hui Huang, Liu, Shi-You +9
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum Physics (quant-ph) #Quantum optics and atomic interactions

paper · pdf · doi:10.48550/arxiv.1411.5499

openalex publication_date 2014/11/20 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28

Abstract

A new entangled quantum state is introduced by applying local coherent superposition (ra⁺ +ta) of photon subtraction and addition to each mode of even entangled coherent state (EECS) and the properties of entanglement are investigated. It is found that the Shchukin-Vogel inseparability, the degree of entanglement and the average fidelity of quantum teleportation of the EECS can be improved due to the coherent superposition operation. The effects of improvement by coherent superposition operation are better than those by single (a⁺) and two-photon (a⁺ b⁺) addition operations under a small region of amplitude.

Citations

• Entanglement of Formation of an Arbitrary State of Two Qubits
• Universal continuous-variable quantum computation: Requirement of optical nonlinearity for photon counting

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