Autonomous multipartite entanglement engines

Abstract

The generation of genuine multipartite entangled states is challenging in practice. Here we explore a new route to this task, via autonomous entanglement engines which use only incoherent coupling to thermal baths and time-independent interactions. We present a general machine architecture, which allows for the generation of a broad range of multipartite entangled states in a heralded manner. Specifically, given a target multiple-qubit state, we give a sufficient condition ensuring that it can be generated by our machine. We discuss the cases of Greenberger-Horne-Zeilinger, Dicke and cluster states in detail. These results demonstrate the potential of purely thermal resources for creating multipartite entangled states useful for quantum information processing.

Thermodynamics of quantum-jump trajectories of open quantum systems subject to stochastic resetting

“…The function ν(k, τ ) must be defined such that the last (58) and the first (57) renewal equation render the same solution for G(k, t) and they are therefore equivalent. This equivalence can be established by taking the Laplace transform of the last renewal equation (58).…”

“…[55,56] and subsequently analyzed in Refs. [19,[57][58][59]. Within these works, stochastic resetting is considered as a further Markovian dissipative process which is added to the ones already present in the Lindblad equation dictating the open system dynamics between consecutive resets.…”

Designing nonequilibrium states of quantum matter through stochastic resetting

“…In the latter case, the Markovian Lindblad equation [25,26] describing the evolution in the presence of Poissonian resetting has been analyzed in Refs. [27][28][29][30][31][32]. Closed quantum systems which are reinitialized to their initial state after Poissonian resetting have been, instead, analyzed without reference to the Lindblad equation in Ref.…”

Perturbation Analysis of Quantum Reset Models

“…Let us remark that this model for a tri-partite open quantum system differs from previous works on reset models in the context of quantum thermodynamics, studying in particular quantum absorption refrigerators and entanglement engines, Refs. [4,30,32]. These models consist of a chain of 2, 3 or N qubits, each of them being coupled to its own thermal bath.…”

“…This is achieved by making specific choices of dissipation channels (corresponding to a fully depolarized quantum channel), see [15,23,33] for examples in specific physical setups. These QRM, thanks to their structural simplicity, present the strong advantage to allow for analytical solutions for the reduced density operator of multipartite quantum systems and have been successfully exploited to assess the dynamics of specific quantum systems, namely small quantum thermal machines made of a few qubits, qutrits or higher-dimensional quantum systems [4,6,19,30,32,33].…”