首页|Topologically protected entanglement switching around exceptional points
Topologically protected entanglement switching around exceptional points
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国家科技期刊平台
NETL
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The robust operation of quantum entanglement states is crucial for applications in quantum information,computing,and communications1-3.However,it has always been a great challenge to complete such a task because of decoherence and disorder.Here,we propose theoretically and demonstrate experimentally an effective scheme to realize robust operation of quantum entanglement states by designing quadruple degeneracy exceptional points.By encircling the exceptional points on two overlapping Riemann energy surfaces,we have realized a chiral switch for entangled states with high fidelity.Owing to the topological protection conferred by the Riemann surface structure,this switching of chirality exhibits strong robustness against perturbations in the encircling path.Furthermore,we have experimentally validated such a scheme on a quantum walk platform.Our work opens up a new way for the application of non-Hermitian physics in the field of quantum information.
Zan Tang、Tian Chen、Xing Tang、Xiangdong Zhang
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Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education,Beijing Key Laboratory of Nanophotonics & Ultrafine Optoelectronic Systems,School of Physics,Beijing Institute of Technology,100081 Beijing,China
National key R & D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China
国家科技期刊平台
NSTL
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