Quantumness protection for open systems in a double-layer environment

• Published in: Science China. Physics, mechanics & astronomy Vol. 63; no. 5; p. 250312
• Main Authors: Qiao, YuLong, Zhang, JiaMing, Chen, YuSui, Jing, Jun, Zhu, ShiYao
• Format: Journal Article
• Language: English
• Published: Beijing Science China Press 01.05.2020; Springer; Springer Nature B.V
• Subjects: Astronomy; Classical and Continuum Physics; Coupled modes; Holes; Information storage; Observations and Techniques; Open systems; Physics; Physics and Astronomy; Quantum entanglement; Qubits (quantum computing); Reservoirs; quantum noise; decoherence; quantum-state-diffusion equation; open quantum systems
• ISSN: 1674-7348; 1869-1927
• DOI: 10.1007/s11433-019-1459-2

We study the dynamics of two-level atomic systems (qubits) subject to a double-layer environment that consists of a network of single-mode cavities coupled to a common reservoir. A general exact master equation for the dynamics of a qubit system can be obtained by the quantum-state-diffusion (QSD) approach, which is extended to our spin-cavity-boson model. The quantumness of the atoms comprising coherence and entanglement is investigated for various configurations of the double-layer environment. The findings indicate that parametric control is available for the preservation and generation of system-quantumness by regulating the cavity network. Moreover the underlying physics is profoundly revealed by an effective model obtained by a unitary transformation. Therefore, our work provides an interesting proposal to protect the quantumness of open systems in the framework of a double-layer environment containing bosonic modes.