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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2401.01776 |
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| _version_ | 1866909502569185280 |
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| author | Khandelwal, Shishir Annby-Andersson, Björn Diotallevi, Giovanni Francesco Wacker, Andreas Tavakoli, Armin |
| author_facet | Khandelwal, Shishir Annby-Andersson, Björn Diotallevi, Giovanni Francesco Wacker, Andreas Tavakoli, Armin |
| contents | We devise an autonomous quantum thermal machine consisting of three pairwise-interacting qubits, two of which are locally coupled to thermal 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. 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 any desired pure two-qubit entangled state, emerging as a dark state of the system. We study the robustness of entanglement production with respect to several relevant parameters, obtaining nearly-maximally-entangled states 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_01776 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Maximal steady-state entanglement in autonomous quantum thermal machines Khandelwal, Shishir Annby-Andersson, Björn Diotallevi, Giovanni Francesco Wacker, Andreas Tavakoli, Armin Quantum Physics We devise an autonomous quantum thermal machine consisting of three pairwise-interacting qubits, two of which are locally coupled to thermal 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. 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 any desired pure two-qubit entangled state, emerging as a dark state of the system. We study the robustness of entanglement production with respect to several relevant parameters, obtaining nearly-maximally-entangled states 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. |
| title | Maximal steady-state entanglement in autonomous quantum thermal machines |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2401.01776 |