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Dipole-dipole interactions enhance non-Markovianity and protect information against dissipation |
| Munsif Jan1,2, Xiao-Ye Xu(许小冶)1,2, Qin-Qin Wang(王琴琴)1,2, Zhe Chen(陈哲)1,2, Yong-Jian Han(韩永建)1,2, Chuan-Feng Li(李传锋)1,2, Guang-Can Guo(郭光灿)1,2 |
1 Key Laboratory of Quantum Information of Chinese Academy of Sciences(CAS), University of Science and Technology of China, Hefei 230026, China;
2 CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China |
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Abstract Preserving non-Markovianity and quantum entanglement from decoherence effect is of theoretical and practical significance in the quantum information processing technologies. In this context, we study a system S that is initially correlated with an ancilla A, which interacts with the environment E via an amplitude damping channel. We also consider dipole-dipole interactions (DDIs) between the system and ancilla, which are responsible for strong correlations. We investigate the impact of DDIs and detuning on the non-Markovianity and information exchange in different environments. We show that DDIs are not only better than detuning at protecting the information (without destroying the memory effect) but also induce memory by causing a transition from Markovian to non-Markovian dynamics. In contrast, although detuning also protects the information, it causes a transition from non-Markovian to the Markovian dynamics. In addition, we demonstrate that the non-Markovianity grows with increasing DDI strength and diminishes with increasing detuning. We also show that the effects of negative detuning and DDIs can cancel out each other, causing a certain loss of coherence and information.
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Received: 10 June 2019
Revised: 10 July 2019
Accepted manuscript online:
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PACS:
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03.65.-w
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(Quantum mechanics)
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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03.67.-a
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(Quantum information)
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03.67.Bg
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(Entanglement production and manipulation)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0304100 and 2016YFA0302700), the National Natural Science Foundation of China (Grant Nos. 61327901, 11474267, 11774335, and 61322506), the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant No. QYZDY-SSW-SLH003), the Fundamental Research Funds for the Central Universities, China (Grnat No. WK2470000026), the National Postdoctoral Program for Innovative Talents, China (Grant No. BX201600146), China Postdoctoral Science Foundation (Grant No. 2017M612073), and Anhui Initiative in Quantum Information Technologies, China (Grant No. AHY020100). The author Munsif Jan is thankful to the China Scholarship Council (CSC) for financial support (Grant No. 10358). |
Corresponding Authors:
Chuan-Feng Li
E-mail: cfli@ustc.edu.cn
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Cite this article:
Munsif Jan, Xiao-Ye Xu(许小冶), Qin-Qin Wang(王琴琴), Zhe Chen(陈哲), Yong-Jian Han(韩永建), Chuan-Feng Li(李传锋), Guang-Can Guo(郭光灿) Dipole-dipole interactions enhance non-Markovianity and protect information against dissipation 2019 Chin. Phys. B 28 090303
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