Experimental realization of self-guided quantum coherence freezing

Shang Yu, Yi-Tao Wang, Zhi-Jin Ke, Wei Liu, Wen-Hao Zhang, Geng Chen, Jian-Shun Tang, Chuan-Feng Li, and Guang-Can Guo
Phys. Rev. A 96, 062324 – Published 20 December 2017

Abstract

Quantum coherence is the most essential characteristic of quantum physics, specifcially, when it is subject to the resource-theoretical framework, it is considered as the most fundamental resource for quantum techniques. Other quantum resources, e.g., entanglement, are all based on coherence. Therefore, it becomes urgently important to learn how to preserve coherence in quantum channels. The best preservation is coherence freezing, which has been studied recently. However, in these studies, the freezing condition is theoretically calculated, and there still lacks a practical way to achieve this freezing; in addition the channels are usually fixed, but actually, there are also degrees of freedom that can be used to adapt the channels to quantum states. Here we develop a self-guided quantum coherence freezing method, which can guide either the quantum channels (tunable-channel scheme with upgraded channels) or the initial state (fixed-channel scheme) to the coherence-freezing zone from any starting estimate. Specifically, in the fixed-channel scheme, the final-iterative quantum states all satisfy the previously calculated freezing condition. This coincidence demonstrates the validity of our method. Our work will be helpful for the better protection of quantum coherence.

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  • Received 26 June 2017
  • Revised 19 September 2017

DOI:https://doi.org/10.1103/PhysRevA.96.062324

©2017 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Shang Yu1,2, Yi-Tao Wang1,2, Zhi-Jin Ke1,2, Wei Liu1,2, Wen-Hao Zhang1,2, Geng Chen1,2, Jian-Shun Tang1,2,*, Chuan-Feng Li1,2,†, and Guang-Can Guo1,2

  • 1Chinese Academy of Science Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
  • 2Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China

  • *tjs@ustc.edu.cn
  • cfli@ustc.edu.cn

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Issue

Vol. 96, Iss. 6 — December 2017

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