Enhancement of quantum correlations between two particles under decoherence in finite-temperature environment

¹ State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University Beijing 100084, China
² Department of Physics & Astronomy, Hearne Institute for Theoretical Physics, Louisiana State University 202 Nicholson Hall, Baton Rouge, LA 70803, USA
³ Tsinghua National Laboratory for Information Science and Technology - Beijing 100084, China
⁴ Collaborative Innovation Center of Quantum Matter - Beijing 100084, China

^(a) gllong@tsinghua.edu.cn

Received: 20 March 2014
Accepted: 7 June 2014

Abstract

Enhancing the quantum correlations in realistic quantum systems interacting with the environment of finite temperature is an important subject in quantum information processing. In this paper, we use weak measurement and measurement reversal to enhance the quantum correlations in a quantum system consisting of two particles. The transitions of the quantum correlations measured by the local quantum uncertainty of qubit-qubit and qutrit-qutrit quantum systems under generalized amplitude damping channels are investigated. We show that, after the weak measurement and measurement reversal, the joint system shows more robustness against decoherence.