Interplay of decoherence and relaxation in a two-level system interacting with an infinite-temperature reservoir

• URL: http://arxiv.org/abs/2303.11870v3
• Date: Sat, 23 Dec 2023 10:31:24 GMT
• Title: Interplay of decoherence and relaxation in a two-level system interacting with an infinite-temperature reservoir
• Authors: Jiaozi Wang, Jochen Gemmer
• Abstract summary: We study the time evolution of a single qubit in contact with a bath. We use the so-called modified Redfield theory which also treats energy conserving interactions non-perturbatively.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study the time evolution of a single qubit in contact with a bath, within the framework of projection operator methods. Employing the so-called modified Redfield theory which also treats energy conserving interactions non-perturbatively, we are able to study the regime beyond the scope of the ordinary approach. Reduced equations of motion for the qubit are derived in a idealistic system where both the bath and system-bath interactions are modeled by Gaussian distributed random matrices. In the strong decoherence regime, a simple relation between the bath correlation function and the decoherence process induced by the energy conserving interaction is found. It implies that energy conserving interactions slow down the relaxation process, which leads to a zeno freezing if they are sufficiently strong. Furthermore, our results are also confirmed in numerical simulations.

Related papers

• Pseudomode treatment of strong-coupling quantum thermodynamics [0.0]
  The evaluation of thermodynamic quantities in strong-coupling regimes requires a nonperturbative knowledge of the bath dynamics. We derive expressions for heat, work, and average system-bath interaction energy that only involve the autocorrelation function of the bath. We show in particular that this method allows for an efficient numerical evaluation of thermodynamic quantities.
  arXiv  Detail & Related papers  (2024-07-25T09:11:45Z)
• Observation of Nonlinear Response and Onsager Regression in a Photon Bose-Einstein Condensate [34.82692226532414]
  The quantum regression theorem states that the correlations of a system at two different times are governed by the same equations of motion as the temporal response of the average values. Here we experimentally demonstrate that the two-time particle number correlations in a photon Bose-Einstein condensate inside a dye-filled microcavity exhibit the same dynamics as the response of the condensate to a sudden perturbation of the dye molecule bath. This confirms the regression theorem for a quantum gas and, moreover, establishes a test of this relation in an unconventional form where the perturbation acts on the bath and only the condensate response is monitored.
  arXiv  Detail & Related papers  (2024-03-07T17:59:58Z)
• Generalized system-bath entanglement theorem for Gaussian environments [10.07019992236203]
  A system-bath entanglement theorem (SBET) with Gaussian environments was established previously in J. Chem. Phys. 152, 034102 ( 2020) In this work, we generalize it to correlation functions. Numerical demonstrations are carried out for the evaluation of the solvation free energy of an electron transfer system.
  arXiv  Detail & Related papers  (2023-12-21T07:11:23Z)
• Modeling the dynamics of quantum systems coupled to large dimensional baths using effective energy states [0.0]
  The quantum dynamics of a low-dimensional system in contact with a large but finite harmonic bath is investigated by coarse-graining the bath into a reduced set of effective energy states. Our model is aimed at intermediate bath sizes in which non-Markovian processes and energy transfer between the bath and the main system are important.
  arXiv  Detail & Related papers  (2023-12-06T12:35:24Z)
• Nonlocal thermoelectric detection of interaction and correlations in edge states [62.997667081978825]
  We propose the nonlocal thermoelectric response as a direct indicator of the presence of interactions, nonthermal states and the effect of correlations. A setup with two controllable quantum point contacts allows thermoelectricity to monitor the interacting system thermalisation.
  arXiv  Detail & Related papers  (2023-07-18T16:28:59Z)
• Dispersive Non-reciprocity between a Qubit and a Cavity [24.911532779175175]
  We present an experimental study of a non-reciprocal dispersive-type interaction between a transmon qubit and a superconducting cavity. We show that the qubit-cavity dynamics is well-described in a wide parameter regime by a simple non-reciprocal master-equation model.
  arXiv  Detail & Related papers  (2023-07-07T17:19:18Z)
• Heat transport and cooling performance in a nanomechanical system with local and non local interactions [68.8204255655161]
  We study heat transport through a one dimensional time-dependent nanomechanical system. The system presents different stationary transport regimes depending on the driving frequency, temperature gradients and the degree of locality of the interactions.
  arXiv  Detail & Related papers  (2022-02-21T12:03:54Z)
• Strong system-bath coupling reshapes characteristics of quantum thermal machines [0.0]
  We study the performance of quantum absorption refrigerators, paradigmatic autonomous quantum thermal machines. We reveal central impacts of strong couplings between the working system and the thermal baths.
  arXiv  Detail & Related papers  (2021-11-09T18:15:25Z)
• Entropy Production and the Role of Correlations in Quantum Brownian Motion [77.34726150561087]
  We perform a study on quantum entropy production, different kinds of correlations, and their interplay in the driven Caldeira-Leggett model of quantum Brownian motion.
  arXiv  Detail & Related papers  (2021-08-05T13:11:05Z)
• Probing eigenstate thermalization in quantum simulators via fluctuation-dissipation relations [77.34726150561087]
  The eigenstate thermalization hypothesis (ETH) offers a universal mechanism for the approach to equilibrium of closed quantum many-body systems. Here, we propose a theory-independent route to probe the full ETH in quantum simulators by observing the emergence of fluctuation-dissipation relations. Our work presents a theory-independent way to characterize thermalization in quantum simulators and paves the way to quantum simulate condensed matter pump-probe experiments.
  arXiv  Detail & Related papers  (2020-07-20T18:00:02Z)
• 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.