Unconventional mechanism of virtual-state population through dissipation

Abstract

Virtual states are a central concept in quantum mechanics. By definition, the probability of finding a quantum system in a virtual state should be vanishingly small at all times. In contrast to this notion, we report a phenomenon occurring in open quantum systems by which virtual states can acquire a sizable population in the long time limit, even if they are not directly coupled to any dissipative channel. This means that the situation where the virtual state remains unpopulated can be metastable. We describe this effect by introducing a two-step adiabiatic elimination method, that we termed hierarchical adiabatic elimination, which allows one to obtain analytical expressions of the timescale of metastability in general open quantum systems. We show how these results can be relevant for practical questions such as the generation of stable and metastable entangled states in dissipative systems of interacting qubits.

References in corpus (10)

• Quantum States and Phases in Driven Open Quantum Systems with Cold Atoms
• Entanglement of two qubits mediated by one-dimensional plasmonic waveguides
• Dissipative preparation of entanglement in optical cavities
• Dissipative Phase Transition in Central Spin Systems
• Quantum Optics of Chiral Spin Networks
• Quantum Spin Dimers from Chiral Dissipation in Cold-Atom Chains
• Atom-only descriptions of the driven-dissipative Dicke model
• Generalized transitionless quantum driving for open quantum systems
• Two-photon resonance fluorescence of two interacting non-identical quantum emitters
• Eternal Adiabaticity