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Physica Scripta

Decoherence suppression of a qutrit system with both spontaneous emission and dephasing by weak measurement and reversal

Qiong Wang, Zhi He, Chunmei Yao

Published Apr 14, 2015• 15 citations
Publisher

Abstract

Decoherence suppression from disturbance of the environment is an essential task in quantum information processing. We investigate decoherence suppression of a qutrit system interacting with a zero-temperature reservoir with both spontaneous emission and dephasing by employing the weak measurement and reversal (WMR) operation. We find that the qutrit decoherence can be efficiently suppressed by solving the master equation of the qutrit system. In particular, WMR can completely suppress the decoherence in the case of strong decay rates.

DOI
10.1088/0031-8949/90/5/055102

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Decoherence suppression from disturbance of the environment is an essential task in quantum information processing. We investigate decoherence suppression of a qutrit system interacting with a zero-temperature reservoir with both spontaneous emission and dephasing by employing the weak measurement and reversal (WMR) operation. We find that the qutrit decoherence can be efficiently suppressed by solving the master equation of the qutrit system. In particular, WMR can completely suppress the decoherence in the case of strong decay rates.
Abstract Decoherence suppression from disturbance of the environment is an essential task in quantum information processing. We investigate the restoration of a qutrit system interacting with a zero-temperature reservoir from amplitude-phase decoherence sources by employing the environment-assisted measurement and reversal (EMR) operation. In particular, by solving the master equation, we get the exact analytical or numerical simulations expressions of the optimal final restoration, showing explicitly that the EMR does indeed can recovery qutrit states.
Abstract Decoherence suppression from disturbance of the environment is an essential task in quantum information processing. Using the non-Hermitian operation approach, decoherence suppression of a qubit system interacting with a zero-temperature reservoir with both spontaneous emission and dephasing is investigated. We derive the exact analytical expressions of the quantum fidelity and find that quantum coherence can be significantly enhanced by controlling the non-Hermitian operator parameters. In particular, the non-Hermitian is more effective in the case of strong decay rates and show better inhibition effect on dephasing process than the spontaneous emission process.
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Protection of entanglement from disturbance of the environment is an essential task in quantum information processing. We examine the validity and limitation of the weak measurement and reversal (WMR) operation in the protection of distributed entanglement from various decoherence sources. Since the entanglement variation can be investigated analytically for an arbitrarily entangled bipartite pure state under three kinds of typical noisy quantum channels, we show explicitly that the WMR operation indeed helps for protecting distributed entanglement from amplitude damping and phase damping, but not for depolarizing. Experimental feasibility for testing our results is discussed using current laboratory techniques.
Abstract Using a non-Hermitian operation approach, we propose a scheme to improve quantum dense coding of a qubit-qubit system interacting with a zero-temperature reservoir with both spontaneous emission and dephasing. By solving the master equation of the two-qubit system, we numerically obtain the final capacity of quantum dense coding. The numerical results show explicitly that the non-Hermitian operation indeed helps to improve the non-Hermitian operation from amplitude-phase decoherence. In particular, non-Hermitian operations can protect quantum dense coding more efficiently in the case of strong decay rates than those with small decay rates.
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.