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Steady Bell State Generation via Magnon-Photon Coupling.
H Y Yuan1, Peng Yan2, Shasha Zheng3,4,5
1Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China.
Physical Review Letters
|February 22, 2020
Summary
Parity-time (PT) symmetry breaking in magnon-photon systems leads to robust, high-fidelity Bell states. This stable entanglement, observed in energy level attraction, offers a new resource for quantum information science.
Area of Science:
- Quantum optics
- Condensed matter physics
- Quantum information science
Background:
- Parity-time (PT) symmetry is a key concept in non-Hermitian physics.
- Magnon-photon systems offer a platform for exploring quantum phenomena.
- Entanglement is crucial for quantum information processing.
Purpose of the Study:
- To investigate the spontaneous breaking of PT symmetry in coupled magnon-photon systems.
- To explore the properties of entangled states formed in the PT-broken phase.
- To understand the robustness of magnon-photon entanglement against environmental perturbations.
Main Methods:
- Theoretical analysis of coupled magnon-photon systems exhibiting energy level attraction.
- Investigation of PT symmetry breaking conditions.
- Characterization of Bell states and entanglement fidelity.
- Analysis of system dynamics under environmental noise.
Main Results:
- Spontaneous PT symmetry breaking observed in the energy level attraction regime.
- Formation of high-fidelity, maximum entangled Bell states in the PT-broken phase.
- Demonstrated robustness of magnon-photon entanglement against environmental perturbations.
- Distinguished behavior compared to normal level repulsion cases.
Conclusions:
- PT symmetry breaking in magnon-photon systems can generate stable and robust entanglement.
- This stable entanglement challenges conventional expectations of instability in broken symmetry phases.
- Magnon-photon entanglement presents a promising resource for quantum information science applications.
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