Negative-Temperature State Relaxation and Reservoir-Assisted Quantum Entanglement in Double Spin Domain Systems

Abstract

Spin collective phenomena including superradiance are even today being intensively investigated with experimental tests performed based on state-of-the-art quantum technologies. Such attempts are not only for the simple experimental verification of predictions from the last century but also as a motivation to explore new applications of spin collective phenomena and the coherent control of the coupling between spin ensembles and reservoirs. In this paper, we investigate the open quantum dynamics of two spin ensembles (double spin domains) coupled to a common bosonic reservoir. We analyze in detail the dynamics of our collective state and its structure by focusing on both the symmetry and asymmetry of this coupled spin system. We find that when the spin size of one of the double domains is larger than that of the other domain, at the steady state this system exhibits two novel collective behaviors: the negative-temperature state relaxation in the smaller spin domain and the reservoir-assisted quantum entanglement between the two domains. These results are the consequence of the asymmetry of this system and the decoherence driven by the common reservoir.

14 pages, 6 figures

References in corpus (15)

• Quantum States and Phases in Driven Open Quantum Systems with Cold Atoms
• An Open-System Quantum Simulator with Trapped Ions
• Cold atoms in cavity-generated dynamical optical potentials
• Quantum technologies with hybrid systems
• Protecting entanglement via the quantum Zeno effect
• Superradiant Hybrid Quantum Devices
• Topical Review: Spins and mechanics in diamond
• Protecting a Spin Ensemble against Decoherence in the Strong-Coupling Regime of Cavity QED
• Inversion of Qubit Energy Levels in Qubit-Oscillator Circuits in the Deep-Strong-Coupling Regime
• Entangling oscillators through environment noise
• Off-resonant entanglement generation in a lossy cavity
• Entanglement between qubits induced by a common environment with a gap
• NMR Evidence for Spin Canting in a Bilayer nu = 2 Quantum Hall System
• Non-equilibrium fractional quantum Hall states visualized by optically detected MRI
• Nuclear Magnetometry Study of Spin Dynamics in Bilayer Quantum Hall Systems

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• Subradiance and Superradiant Long Range Excitation Transport among Quantum Emitter Ensembles in a Waveguide
• Nonequilibrium dynamics in a spin valve with noncollinear magnetization
• Double Nuclear Spin Relaxation in Hybrid Quantum Hall Systems
• Conditional Entanglement Amplification via Non-Hermitian Superradiant Dynamics
• Reservoir-assisted energy migration through multiple spin-domains