Generation of macroscopic quantum-superposition states by linear coupling to a bath

Abstract

We demonstrate through an exactly solvable model that collective coupling to any thermal bath induces effectively nonlinear couplings in a quantum many-body (multi-spin) system. The resulting evolution can drive an uncorrelated large-spin system with high probability into a macroscopic quantum-superposition state. We discuss possible experimental realizations.

4 pages, 2 figures, Physical Review Letters (in press)

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• From Zeno to anti-Zeno: decoherence-control dependence on the quantum statistics of the bath
• Creating cat states in one-dimensional quantum walks using delocalized initial states
• Dynamical control of quantum state transfer within hybrid open systems
• Dynamics of a two-level system under the simultaneous influence of a spin bath and a boson bath
• Thermal Baths as Quantum Resources: More Friends than Foes?
• Exact dynamics of the homogeneous two-qubit $XXZ$ central spin model with the spin bath prepared in superpositions of symmetric Dicke states
• Weak value amplification of atomic cat states
• Fast macroscopic-superposition-state generation by coherent driving
• Remote Cooling of Spin-ensembles through a Spin-mechanical Hybrid Interface
• A master equation incorporating the system-environment correlations present in the joint equilibrium state