Collisional model with dissipative and dephasing baths: Nonadditive effects at strong coupling

• URL: http://arxiv.org/abs/2509.10988v1
• Date: Sat, 13 Sep 2025 21:37:43 GMT
• Title: Collisional model with dissipative and dephasing baths: Nonadditive effects at strong coupling
• Authors: Alessandro Prositto, Carlos Ramon-Escandell, Dvira Segal,
• Abstract summary: We show that when both baths act concurrently, a strong system-bath coupling gives rise to nonadditive effects in the dynamics.<n>A prominent signature of this nonadditivity is the characteristic it slowing down of population relaxation, driven by the influence of the dephasing bath.
• Score: 39.146761527401424
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The repeated interaction model provides a framework for emulating and analyzing the dynamics of open quantum systems. We explore here the dynamics generated by this protocol in a system that is simultaneously coupled to two baths through noncommuting system operators. One bath is made to couple to nondiagonal elements of the system, thus it induces dissipative dynamics, while the other couples to diagonal elements, and by itself it generates pure dephasing. By solving the problem analytically exactly, we show that when both baths act concurrently, a strong system-bath coupling gives rise to nonadditive effects in the dynamics. A prominent signature of this nonadditivity is the characteristic {\it slowing down} of population relaxation, driven by the influence of the dephasing bath. Beyond dynamics, we investigate the thermodynamic behavior of the model. Previous studies, using quantum master equations, showed that strong system-bath coupling created bath-cooperativity in this model, allowing heat exchange to the dephasing (diagonally coupled) bath. We find instead that, under the repeated interaction scheme, heat flows exclusively to the dissipative bath (coupled through nondiagonal elements). Our results highlight the need for a deeper understanding of the types of open quantum system dynamics and steady-state phenomena that emerge within the repeated interaction framework and the relation of this protocol to other common open quantum system techniques.

Related papers

• Unveiling coherent dynamics in non-Markovian open quantum systems: exact expression and recursive perturbation expansion [44.99833362998488]
  We introduce a systematic framework to derive the effective Hamiltonian governing the coherent dynamics of non-Markovian open quantum systems.<n>Applying our framework to paradigmatic spin systems, we reveal how environmental correlations influence energy shifts and eigenbasis rotations.
  arXiv  Detail & Related papers  (2025-06-04T15:55:22Z)
• Suppression of decoherence dynamics by a dissipative bath at strong coupling [0.0]
  Control of decoherence in open quantum systems has become a topic of great interest due to the emergence of quantum technologies that depend on quantum coherent effects.<n>In this work, we investigate the decoherence dynamics of systems coupled to multiple baths through noncommuting systems' operators.<n>By building on cooperative effects between baths, we propose a novel strategy to mitigate rapid decoherence.
  arXiv  Detail & Related papers  (2025-04-03T17:41:29Z)
• Bath Dynamical Decoupling with a Quantum Channel [44.99833362998488]
  We find that bath dynamical decoupling works if and only if the kick is ergodic.<n>We study in which circumstances CPTP kicks on a mono-partite quantum system induce quantum Zeno dynamics with its Hamiltonian cancelled out.
  arXiv  Detail & Related papers  (2024-09-27T07:47:52Z)
• Open quantum systems with non-commuting coupling operators: An analytic approach [0.0]
  We present an analytic approach to treat open quantum systems strongly coupled to multiple environments via noncommuting system operators.<n>For a spin impurity coupled to both dissipative and decoherring environments, the effective Hamiltonian predicts the suppression of relaxation by decoherence.
  arXiv  Detail & Related papers  (2024-08-03T20:56:35Z)
• Emergence of fluctuating hydrodynamics in chaotic quantum systems [47.187609203210705]
  macroscopic fluctuation theory (MFT) was recently developed to model the hydrodynamics of fluctuations. We perform large-scale quantum simulations that monitor the full counting statistics of particle-number fluctuations in boson ladders. Our results suggest that large-scale fluctuations of isolated quantum systems display emergent hydrodynamic behavior.
  arXiv  Detail & Related papers  (2023-06-20T11:26:30Z)
• Spin-boson model under dephasing: Markovian vs Non-Markovian dynamics [0.0]
  We show that the characteristic frequency of the spin dynamics changes in a simple fashion with dephasing. Our findings are relevant to quantum simulation of the spin-boson model in the regime of strong coupling in trapped ions and circuit QED architectures.
  arXiv  Detail & Related papers  (2023-04-28T22:07:29Z)
• Quantum chaos and thermalization in the two-mode Dicke model [77.34726150561087]
  We discuss the onset of quantum chaos and thermalization in the two-mode Dicke model. The two-mode Dicke model exhibits normal to superradiant quantum phase transition. We show that the temporal fluctuations of the expectation value of the collective spin observable around its average are small and decrease with the effective system size.
  arXiv  Detail & Related papers  (2022-07-08T11:16:29Z)
• Decimation technique for open quantum systems: a case study with driven-dissipative bosonic chains [62.997667081978825]
  Unavoidable coupling of quantum systems to external degrees of freedom leads to dissipative (non-unitary) dynamics. We introduce a method to deal with these systems based on the calculation of (dissipative) lattice Green's function. We illustrate the power of this method with several examples of driven-dissipative bosonic chains of increasing complexity.
  arXiv  Detail & Related papers  (2022-02-15T19:00:09Z)
• Unification of Random Dynamical Decoupling and the Quantum Zeno Effect [68.8204255655161]
  We show that the system dynamics under random dynamical decoupling converges to a unitary with a decoupling error that characteristically depends on the convergence speed of the Zeno limit. This reveals a unification of the random dynamical decoupling and the quantum Zeno effect.
  arXiv  Detail & Related papers  (2021-12-08T11:41:38Z)
• Exact dynamics of non-additive environments in non-Markovian open quantum systems [0.0]
  We present a numerically-exact and efficient technique for tackling the problem of capturing multi-bath system dynamics. We test the method by applying it to a simple model system that exhibits non-additive behaviour. We uncover a new regime where the quantum Zeno effect leads to a fully mixed state of the electronic system.
  arXiv  Detail & Related papers  (2021-09-17T10:08:37Z)
• Dynamics of quantum correlations in a Qubit-Oscillator system interacting via a dissipative bath [0.0]
  We study the entanglement dynamics in a bipartite system consisting of a qubit and a harmonic oscillator interacting only through their coupling with the same bath. Based on the Kossakowski Matrix, we show that non-classical correlations including entanglement can be generated by the considered dynamics.
  arXiv  Detail & Related papers  (2020-02-11T02:29:27Z)

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.