Maximal steady-state entanglement in autonomous quantum thermal machines

• URL: http://arxiv.org/abs/2401.01776v1
• Date: Wed, 3 Jan 2024 15:01:22 GMT
• Title: Maximal steady-state entanglement in autonomous quantum thermal machines
• Authors: Shishir Khandelwal, Bj\"orn Annby-Andersson, Giovanni Francesco Diotallevi, Andreas Wacker, Armin Tavakoli
• Abstract summary: We devise an autonomous quantum thermal machine consisting of three pairwise-interacting qubits, two of which are locally coupled to separate classical reservoirs. The machine operates autonomously, as it requires no time-coherent control, external driving or quantum bath engineering. We show that this out-of-equilibrium system can deterministically generate a maximally entangled steady-state between two of the qubits, or in fact, any desired pure two-qubit entangled state, emerging as a dark state of the system.
• Score: 10.310620862420064
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We devise an autonomous quantum thermal machine consisting of three pairwise-interacting qubits, two of which are locally coupled to separate classical reservoirs. The machine operates autonomously, as it requires no time-coherent control, external driving or quantum bath engineering, and is instead propelled by a chemical potential bias between the reservoirs. Under ideal conditions, we show that this out-of-equilibrium system can deterministically generate a maximally entangled steady-state between two of the qubits, or in fact, any desired pure two-qubit entangled state, emerging as a dark state of the system. The entanglement production is also robust, such that nearly-maximally-entangled states can be generated well-away from the ideal regime of operation. Furthermore, we show that our machine architecture can be generalised to a configuration with $2n-1$ qubits, in which only a potential bias and two-body interactions are sufficient to generate genuine multipartite maximally entangled steady states in the form of a W state of $n$ qubits.

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