Atomic Evolution and Entanglement of Two Qubits in Photon Superfluid
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By using reservoir theory, we investigate the evolution of an atom placed in photon superfluid and study the entanglement properties of two qubits interacting with photon superfluid. It is found that the atomic decay rate in photon superfluid changes periodically with position of the atom and the decay rate can be inhibited compared to that in usual electromagnetic environment without photon superfluid. It is also found that when two atoms are separately immersed in their own local photon-superfluid reservoir, the entanglement sudden death or birth occurs or not only depends on the initial state of the qubits. What is more, we find a possible case that the concurrence between two qubits can remain a constant value by choosing proper values of parameters of the system, which may provide a new way to preserve quantum entanglement.
KeywordsAtomic evolution Entanglement Photon superfluid
This work is supported by the National Natural Science Foundation of China (No. 11204088), Science and Technology Program of Guangzhou, China (No. 201607010019), Science and Technology Planning Project of Guangdong Province, China (No. 2015B010127004), and SRP of South China University of Technology.