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Protecting geometric quantum discord via partially collapsing measurements of two qubits in multiple bosonic reservoirs |
| Xue-Yun Bai(白雪云) and Su-Ying Zhang(张素英)† |
| Institute of Theoretical Physics and State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan 030006, China |
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Abstract We study the dynamics of geometric quantum discord (GQD) between two qubits, each qubit interacting at the same time with K independent multiple bosonic reservoirs at zero temperature. In both weak and strong qubit-reservoirs coupling regimes, we find that the increase of the number K of reservoirs can induce the damped oscillation of GQD, and enhance the memory effects of the overall environment. And the Hilbert-Schmidt norm GQD (two-norm GQD) is always smaller than the trace norm geometric quantum discord (one-norm GQD). Therefore, the one-norm GQD is a better way to measure the quantum correlation. Finally, we propose an effective strategy to improve GQD by using partially collapsing measurements, and we find that the protection effect is better with the increase of the weak measurement strength.
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Received: 28 December 2021
Revised: 25 January 2022
Accepted manuscript online: 27 January 2022
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PACS:
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03.65.Ud
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(Entanglement and quantum nonlocality)
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03.65.Ta
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(Foundations of quantum mechanics; measurement theory)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11772177). |
Corresponding Authors:
Su-Ying Zhang
E-mail: zhangsy@sxu.edu.cn
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Cite this article:
Xue-Yun Bai(白雪云) and Su-Ying Zhang(张素英) Protecting geometric quantum discord via partially collapsing measurements of two qubits in multiple bosonic reservoirs 2022 Chin. Phys. B 31 040308
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