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Unlocking thermodynamic multitasking: Exploring the functioning of two-qubit engines through coherence and entanglement

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  • Tarif, Hachem
  • Slaoui, Abdallah
  • Laamara, Rachid Ahl

Abstract

Recent studies have investigated the role of entanglement in the operation of a two-qubit system as a heat engine, showing that work can be extracted from a single heat bath without direct heat dissipation between the two-qubit system and the cold bath (Bresque et al., 2021). In this work, we explore the impact of operating the same two-qubit system model with two heat baths and direct dissipation to the environment by applying both a local and a global Markovian master equation. The addition of a second heat bath enables the system to operate in different modes depending on the initial quantum state. We examine the temporal behavior of concurrence entanglement and quantum coherence, analyzing their observable roles in transitions between various operational regimes. Additionally, we investigate the evolution of information flow throughout the working cycle of the two-qubit system, focusing on the influence of individual and collective decoherence on the system’s efficiency and operational modes. We identify the optimal parameter regions for the engine and refrigerator modes to achieve maximum performance. Finally, we investigate the effect of coherence outside the system on its thermodynamic quantities.

Suggested Citation

  • Tarif, Hachem & Slaoui, Abdallah & Laamara, Rachid Ahl, 2025. "Unlocking thermodynamic multitasking: Exploring the functioning of two-qubit engines through coherence and entanglement," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 668(C).
    • Handle: RePEc:eee:phsmap:v:668:y:2025:i:c:s0378437125001219
    DOI: 10.1016/j.physa.2025.130469
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    References listed on IDEAS

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    1. Kumar, Ashutosh & Lahiri, Sourabh & Bagarti, Trilochan & Banerjee, Subhashish, 2023. "Thermodynamics of one and two-qubit nonequilibrium heat engines running between squeezed thermal reservoirs," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 623(C).
    2. Mahmoudi, Maryam, 2020. "The effects of Dzyaloshinskii–Moriya interaction on entanglement dynamics of a spin chain in a non-Markovian regime," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 545(C).
    3. Slaoui, Abdallah & Salah, Ahmed & Daoud, Mohammed, 2020. "Influence of Stark-shift on quantum coherence and non-classical correlations for two two-level atoms interacting with a single-mode cavity field," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 558(C).
    4. Christian D. Marciniak & Thomas Feldker & Ivan Pogorelov & Raphael Kaubruegger & Denis V. Vasilyev & Rick Bijnen & Philipp Schindler & Peter Zoller & Rainer Blatt & Thomas Monz, 2022. "Optimal metrology with programmable quantum sensors," Nature, Nature, vol. 603(7902), pages 604-609, March.
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    1. Vijayan, Vipin & Chotorlishvili, L. & Ernst, A. & Katsnelson, M.I. & Parkin, S.S.P. & Mishra, Sunil K., 2025. "Quantum heat engine with near-zero irreversible work utilizing quantum skyrmion working substance," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 669(C).

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