Generation of Quantum Entanglement in Autonomous Thermal Machines: Effects of Non-Markovianity, Hilbert Space Structure, and Quantum Coherence

• URL: http://arxiv.org/abs/2508.18056v2
• Date: Thu, 30 Oct 2025 04:58:12 GMT
• Title: Generation of Quantum Entanglement in Autonomous Thermal Machines: Effects of Non-Markovianity, Hilbert Space Structure, and Quantum Coherence
• Authors: Achraf Khoudiri, Khadija El Anouz, Abderrahim El Allati,
• Abstract summary: We investigate entanglement generation in an external quantum system via interaction with a quantum autonomous thermal machine.<n>We show that entanglement is generated only under cycle A, which is associated with stronger non-Markovian behavior and higher coherence correlations.<n>Our results demonstrate that temperature differences, Hilbert space structure, and coherence serve as quantum resources for controlling and enhancing entanglement in quantum thermodynamic settings.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a theoretical investigation of entanglement generation in an external quantum system via interaction with a quantum autonomous thermal machine (QATM) under non-Markovian dynamics. The QATM, composed of two qubits each coupled to independent thermal reservoirs, interacts with an external system of two additional qubits. By analyzing the Hilbert space structure, energy level configurations, and temperature gradients, we define a common interaction between the QATM qubits and the external system qubits, which allows the definition of two thermodynamic cycles (A and B) governed by virtual temperatures and energy-conserving transitions. We demonstrate that the QATM can act as a structured reservoir capable of inducing non-Markovian memory effects, as highlighted by negative entropy production rates. Using mutual information and concurrence, we show that entanglement is generated only under cycle A, which is associated with stronger non-Markovian behavior and higher coherence correlations. Our results demonstrate that temperature differences, Hilbert space structure, and coherence serve as quantum resources for controlling and enhancing entanglement in quantum thermodynamic settings, with parameters consistent with experimental superconducting qubit platforms.

Related papers

• Steady-state coherence in multipartite quantum systems: its connection with thermodynamic quantities and impact on quantum thermal machines [4.793664087699155]
  We study the unique contributions of quantum coherence among different subsystems of a multipartite system to work and heat currents.<n>Our scheme is versatile, capable of functioning as a refrigerator, an engine, and an accelerator, with its performance being highly sensitive to the configuration settings.
  arXiv  Detail & Related papers  (2025-02-06T02:26:01Z)
• Thermal quantum correlations of a single electron in a double quantum dot with transverse magnetic field [0.0]
  We investigate the thermal quantum correlations in a semiconductor double quantum dot system.<n>We highlight the roles of thermal entanglement and correlated coherence in generating quantum correlations.<n>This suggests that quantum algorithms based solely on correlated coherence might be more resilient than those relying on entanglement.
  arXiv  Detail & Related papers  (2024-12-26T03:43:36Z)
• Quantum Thermodynamics of Open Quantum Systems: Nature of Thermal Fluctuations [0.0]
  We investigate the thermodynamic behavior of open quantum systems through the Hamiltonian of Mean Force. By analyzing both weak and strong coupling regimes, we uncover the impact of environmental interactions on quantum thermodynamic quantities.
  arXiv  Detail & Related papers  (2024-07-31T13:18:06Z)
• Chiral quantum heating and cooling with an optically controlled ion [15.029218109713296]
  Quantum heat engines and refrigerators are open quantum systems, whose dynamics can be well understood using a non-Hermitian formalism. We demonstrate, using a Paul-trapped ultracold ion, the first chiral quantum heating and refrigeration by dynamically encircling a closed loop. Our experiments have revealed that not only the adiabaticity-breakdown but also the Landau-Zener-St"uckelberg process play an essential role during dynamic encircling.
  arXiv  Detail & Related papers  (2024-05-29T09:31:55Z)
• Thermalization and Criticality on an Analog-Digital Quantum Simulator [133.58336306417294]
  We present a quantum simulator comprising 69 superconducting qubits which supports both universal quantum gates and high-fidelity analog evolution. We observe signatures of the classical Kosterlitz-Thouless phase transition, as well as strong deviations from Kibble-Zurek scaling predictions. We digitally prepare the system in pairwise-entangled dimer states and image the transport of energy and vorticity during thermalization.
  arXiv  Detail & Related papers  (2024-05-27T17:40:39Z)
• Limits for coherent optical control of quantum emitters in layered materials [49.596352607801784]
  coherent control of a two-level system is among the most essential challenges in modern quantum optics. We use a mechanically isolated quantum emitter in hexagonal boron nitride to explore the individual mechanisms which affect the coherence of an optical transition under resonant drive. New insights on the underlying physical decoherence mechanisms reveals a limit in temperature until which coherent driving of the system is possible.
  arXiv  Detail & Related papers  (2023-12-18T10:37:06Z)
• Mixing thermal coherent states for precision and range enhancement in quantum thermometry [0.0]
  We propose the realization of a special mixture of thermal coherent states by coupling a thermal bath with a two-level system that is longitudinally coupled to a resonator.<n>We find that the state of the resonator is a special mixture of two oppositely displaced thermal coherent states, whereas the two-level system remains thermal.<n>In this context, the resonator functions as a probe to measure the unknown temperature of a bath mediated by a two-level system.
  arXiv  Detail & Related papers  (2023-06-07T12:04:55Z)
• Non-Markovianity through entropy-based quantum thermodynamics [0.0]
  We propose a measure of non-Markovianity based on the heat flow for single-qubit quantum evolutions. This measure can be applied for unital dynamical maps that do not invert the sign of the internal energy.
  arXiv  Detail & Related papers  (2022-10-07T18:09:32Z)
• Implementation of a two-stroke quantum heat engine with a collisional model [50.591267188664666]
  We put forth a quantum simulation of a stroboscopic two-stroke thermal engine in the IBMQ processor. The system consists of a quantum spin chain connected to two baths at their boundaries, prepared at different temperatures using the variational quantum thermalizer algorithm.
  arXiv  Detail & Related papers  (2022-03-25T16:55:08Z)
• Thermal entanglement and quantum coherence of a single electron in a double quantum dot with Rashba Interaction [0.0]
  We study the thermal quantum coherence in a semiconductor double quantum dot. The main goal of this work is to provide a good understanding of the effects of temperature and several parameters in quantum coherence.
  arXiv  Detail & Related papers  (2022-03-12T01:14:26Z)
• Taking the temperature of a pure quantum state [55.41644538483948]
  Temperature is a deceptively simple concept that still raises deep questions at the forefront of quantum physics research. We propose a scheme to measure the temperature of such pure states through quantum interference.
  arXiv  Detail & Related papers  (2021-03-30T18:18:37Z)
• Evolution of a Non-Hermitian Quantum Single-Molecule Junction at Constant Temperature [62.997667081978825]
  We present a theory for describing non-Hermitian quantum systems embedded in constant-temperature environments. We find that the combined action of probability losses and thermal fluctuations assists quantum transport through the molecular junction.
  arXiv  Detail & Related papers  (2021-01-21T14:33:34Z)
• Spin Entanglement and Magnetic Competition via Long-range Interactions in Spinor Quantum Optical Lattices [62.997667081978825]
  We study the effects of cavity mediated long range magnetic interactions and optical lattices in ultracold matter. We find that global interactions modify the underlying magnetic character of the system while introducing competition scenarios. These allow new alternatives toward the design of robust mechanisms for quantum information purposes.
  arXiv  Detail & Related papers  (2020-11-16T08:03:44Z)
• Ergotropy from coherences in an open quantum system [0.0]
  We show that it is possible to have non-zero ergotropy in the steady-states of an open quantum system consisting of qubits. Our results suggest that one can design a quantum battery that is charged by a dissipative thermal bath in the weak coupling regime.
  arXiv  Detail & Related papers  (2020-05-18T07:03:39Z)
• Out-of-equilibrium quantum thermodynamics in the Bloch sphere: temperature and internal entropy production [68.8204255655161]
  An explicit expression for the temperature of an open two-level quantum system is obtained. This temperature coincides with the environment temperature if the system reaches thermal equilibrium with a heat reservoir. We show that within this theoretical framework the total entropy production can be partitioned into two contributions.
  arXiv  Detail & Related papers  (2020-04-09T23:06:43Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.