Entanglement and its dynamics in open, dissipative systems

Abstract

Quantum mechanical entanglement can exist in noisy open quantum systems at high temperature. A simple mechanism, where system particles are randomly reset to some standard initial state, can counteract the deteriorating effect of decoherence, resulting in an entangled steady state far from thermodynamical equilibrium. We present models for both gas-type systems and for strongly coupled systems. We point out in which way the entanglement resulting from such a reset mechanism is different from the entanglement that one can find in thermal states. We develop master equations to describe the system and its interaction with an environment, study toy models with two particles (qubits), where the master equation can often be solved analytically, and finally examine larger systems with possibly fluctuating particle numbers. We find that in gas-type systems, the reset mechanism can produce an entangled steady state for an arbitrary temperature of the environment, while this is not true in strongly coupled systems. But even then, the temperature range where one can find entangled steady states is typically much higher with the reset mechanism.

30 pages, 15 figures

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• Heralded generation of maximal entanglement in any dimension via incoherent coupling to thermal baths
• Control-limited perfect state transfer, quantum stochastic resonance and many-body entangling gate in imperfect qubit registers
• Non-Markovianity and coherence of a moving qubit inside a leaky cavity
• Steady state entanglement of two coupled qubits
• Quantum Fisher Information of an Open and Noisy System in the Steady State
• Stochastic resonance phenomena in spin chains
• Entanglement enhancement induced by noise in inhomogeneously monitored systems
• Perturbation Analysis of Quantum Reset Models
• Entanglement generation from athermality
• Impossibility of bosonic autonomous entanglement engines in the weak-coupling limit
• Finite-time dynamics of an entanglement engine: current, fluctuations and kinetic uncertainty relations
• Transport approach to quantum state tomography
• Anomalous decoherence effects in driven coupled quantum spin systems
• Optical remote control of a charge qubit