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Laser Physics

Effect of parity–time symmetry operation on entanglement distribution in two parallel Heisenberg spin chains

Wang Qiong, Li-Zheng Cheng, Zhi He

Published Oct 1, 2024• 6 citations
Publisher

Abstract

Abstract The effect of the parity–time ( PT ) symmetry operation on the entanglement transfer in two parallel Heisenberg spin chains is investigated. We give two schemes, i.e. pre- and post- PT symmetric operations, to demonstrate the performance of the PT symmetric operation on the entanglement dynamics of two qubits. In our investigation, we find that the effect of pre- PT symmetric operation schemes on the protection of entanglement of two qubits in the case of double spin chains is superior to that of the single spin chain case. Conversely, the effect of the post- PT symmetric operation scheme on the protection of entanglement of two qubits in the single spin chain case is better than that in the double spin chain case.

DOI
10.1088/1555-6611/ad7c3a

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Abstract In this letter, we explore the dynamics and protection of nonlocal advantage of quantum coherence (NAQC) for an entangled two-qubit system subjected to a noisy environment by performing parity-time ( PT ) symmetric operations on one of the two particles. For comparison, we investigate the protection of Bell nonlocality, quantum coherence, and entanglement by local PT- symmetric operations. Here, we show that the NAQC, Bell nonlocality, quantum coherence, and entanglement of a bipartite entangled state can be improved effectively by the local PT -symmetric operation and verify that the protection effect is better with the increase of PT- symmetric operation strength.
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Abstract We investigate the effect of local parity-time ( PT ) symmetric operation on quantum teleportation in non-Markovian environments, focusing on resonant and off-resonant regimes. An exactly solvable two-qubit model with independent structured reservoirs is built to derive the average teleportation fidelity. We show that the PT symmetric operation lead to oscillatory fidelity decay with local revivals instead of monotonic decay, and optimally PT symmetric operation can stably keep the average fidelity above the classical 2/3 limit even in off-resonant non-Markovian regimes, effectively protecting the quantum advantage of teleportation.