Year: 2022
Type: article
Abstract: In the past years, many efforts have been made to study various noteworthy phenomena in both parity-time $(\mathcal{PT})$ and anti-parity-time $(\mathcal{APT})$ symmetric systems. However, entanglement dynamics in $\mathcal{APT}$-symmetric systems has not previously been investigated in both theory and experiments. Here, we investigate the entanglement evolution of two qubits in an $\mathcal{APT}$-symmetric system. In the $\mathcal{APT}$-symmetric unbroken regime, our theoretical simulations demonstrate the periodic oscillations of entanglement when each qubit evolves identically, while the nonperiodic oscillations of entanglement when each qubit evolves differently. In particular, when each qubit evolves near the exceptional point in the $\mathcal{APT}$-symmetric unbroken regime, there exist entanglement sudden vanishing and revival. Moreover, our simulations demonstrate rapid decay and delayed death of entanglement provided one qubit evolves in the $\mathcal{APT}$-symmetric broken regime. In this work, we also perform an experiment with a linear optical setup. The experimental results agree well with our theoretical simulation results. Our findings reveal novel phenomena of entanglement evolution in the $\mathcal{APT}$-symmetric system and opens a new direction for future studies on the dynamics of quantum entanglement in multiqubit $\mathcal{APT}$-symmetric systems or other non-Hermitian quantum systems.
Source: Physical Review Research
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,625
Funders: Foundational Questions Institute, Asian Office of Aerospace Research and Development, National Natural Science Foundation of China, Nippon Telegraph and Telephone, Japan Society for the Promotion of Science, Japan Science and Technology Agency, Moonshot Research and Development Program, Army Research Office
Awards: G1064757669, G1429566569, G185954890, G2183223053, G2365865096, G2441868293, G2490340067, 多腔体系中超导比特量子态制备与操纵研究, G3090458625, G321588361, G3512592488, Quantum optics in quantum hybrid systems, G4879592629, G5473779960, G5620609039, 誤り耐性型量子コンピュータにおける理論・ソフトウェアの研究開発, G6483027378, G7199236559, G7452299184, G7904985311, G8883783173
OpenAlex ID: W4285029644