Amplification of quantum entanglement by non-Hermitian operation under phase decoherence source. (23rd August 2021)

• Record Type: Journal Article
• Authors: Wang, Qiong; Xu, Lan; Yuan, Ji-Bing; He, Zhi
• Is Part Of: Laser physics. Volume 31:Number 10(2021)
• Publication Date: 2021-08-23
• Subjects: qubit–qubit system -- non-Hermitian operation -- phase decoherence; Lasers -- Periodicals; 621.36605
• DOI: 10.1088/1555-6611/ac1c10
• Languages: English
• ISSNs: 1054-660X

Abstract

Abstract: Protection of entanglement from disturbance of the environment is an essential task in quantum information processing. We study the dynamic behaviours of quantum entanglement between two uncoupled qubits, which are immersed in a common phase decoherence environment. We examine the validity of the local non-Hermitian operation in the amplification of qubit–qubit entanglement. In particular, using analytical and numerical investigations, we show explicitly that the quantum entanglement of the two qubits can be greatly amplified by means of non-Hermitian operation.