Heisenberg-Type Quantum Steering by Continuous Weak Measurement in Circuit QED

• 来源期刊: 理论物理通讯（英文版）
• 年，卷（期）: 2019,（7）
• 页码范围: 798-806
• 页数: 9页
• 语种: 英文
• DOI: 10.1088/0253-6102/71/7/798

摘要

Quantum steering has attracted great interest in the last decade,especially in the celebrated optomechanical,cold atom,and quantum optical systems.However,there is still a lack of studies on quantum steering in circuit quantum electrodynamics (QED),which provides a useful experimental platform for revealing novel quantum phenomena.In this work,we investigate the steering of qubit by continuous weak measurement in a circuit QED system and establish a set of multiplicative steering inequalities based on the Heisenberg uncertainty principle.Different from the widely studied systems mentioned above,multiplicative steering inequalities in the circuit QED system are in various forms.We find that only a portion of them can be used to show the detection dependence of the qubit state and we also analyze the reason.Furthermore,we discuss several conditions for the violation of a typical steering inequality,including the measurement strength and methods in detecting the cavity field as well as the quantum efficiency of the detector.This preliminary work could be helpful to quantum steering experiments in circuit QED systems.