Markov Quantum Feedback Control Based on Homodyne Measurement of a Two-Qubit System |
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| Authors: | ZHU Jing-Min and WANG Shun-Jin |
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| Affiliation: | 1.College of Optoelectronics Technology, Chengdu University of Information Technology, Chengdu 610225, China;2.Department of Physics, Sichuan University, Chengdu 610064, China |
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| Abstract: | We consider the system consisting of two qubits collectively damped,with the output being unit-efficiency measured and subsequently fedback to control the system state. Our primary goal in this paper is (i) to solve the feedback-modified master equation, (ii) to demonstrate the ability of feedback control based on the solutions, and (iii) to pick out different steady states by choosing different driving strengths and feedback strengths tocounteract the effects of both damping and the measurement back-action on the system. We further investigate some properties of the equilibrium steady state, its distribution probability and entanglement vs. the driving and feedback amplitudes. We find that in our feedback model feedback plays a negative role in producing entanglement. |
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| Keywords: | homodyne measurement Markov quantum feedback control negativity |
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