Open quantum systems decay across time

• URL: http://arxiv.org/abs/2006.02358v1
• Date: Wed, 3 Jun 2020 16:06:30 GMT
• Title: Open quantum systems decay across time
• Authors: Juliane Klatt and Chahan Michael Kropf and Stefan Yoshi Buhmann
• Abstract summary: We first revisit the meaning, domain and contradictions of a few of the most widely used approximations. We derive an effective time-dependent decay theory and corresponding generalized quantum regression relations for an open quantum system linearly coupled to an environment.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The description of an open quantum system's decay almost always requires several approximations as to remain tractable. Here, we first revisit the meaning, domain and seeming contradictions of a few of the most widely used of such approximations: semi-group Markovianity, linear response theory, Wigner--Weisskopf and rotating-wave approximation. Secondly, we derive an effective time-dependent decay theory and corresponding generalized quantum regression relations for an open quantum system linearly coupled to an environment. This theory covers all timescales, and subsumes the Markovian and linear-response results as limiting cases. Finally, we apply our theory to the phenomenon of quantum friction.

Related papers

• Perfect Wave Transfer in Continuous Quantum Systems [0.9903198600681908]
  We show that reflection symmetry is necessary for perfect wave transfer (PWT) in any inhomogeneous conformal field theory. Using bosonization, our results extend these notions to interacting quantum field theories.
  arXiv  Detail & Related papers  (2024-08-01T17:15:44Z)
• Linear response theory for cavity QED materials [41.94295877935867]
  We derive closed formulas for various responses of both the cavity and the matter. We discover novel excitations in quantum magnets, where the cavity binds magnon pairs into localized states.
  arXiv  Detail & Related papers  (2024-06-17T18:00:01Z)
• Generalized quantum measurement in spin-correlated hyperon-antihyperon decays [11.594851987280764]
  We introduce a generalized quantum measurement description for decay processes of spin-1/2 hyperons. We validate this approach by aligning it with established theoretical calculations. We employ quantum simulation to observe the violation of CHSH inequalities in hyperon decays.
  arXiv  Detail & Related papers  (2024-02-26T13:54:20Z)
• Long-term behaviour in an exactly solvable model of pure decoherence and the problem of Markovian embedding [0.0]
  We consider a well-known exactly solvable model of an open quantum system with pure decoherence. It is worthwhile to study how the long-term rate of decoherence depends on the spectral density characterizing the system-bath interaction.
  arXiv  Detail & Related papers  (2023-11-27T17:09:27Z)
• Second Response Theory: A Theoretical Formalism for the Propagation of Quantum Superpositions [0.0]
  We expand a previously developed size-extensive formalism within coupled cluster theory, called second response theory, so it propagates quantum systems. Our theory shows strong consistency with numerically exact results for the determination of quantum mechanical observables, probabilities, and coherences.
  arXiv  Detail & Related papers  (2023-06-13T17:33:22Z)
• Quantum Instability [30.674987397533997]
  We show how a time-independent, finite-dimensional quantum system can give rise to a linear instability corresponding to that in the classical system. An unstable quantum system has a richer spectrum and a much longer recurrence time than a stable quantum system.
  arXiv  Detail & Related papers  (2022-08-05T19:53:46Z)
• Quantum nonreciprocal interactions via dissipative gauge symmetry [18.218574433422535]
  One-way nonreciprocal interactions between two quantum systems are typically described by a cascaded quantum master equation. We present a new approach for obtaining nonreciprocal quantum interactions that is completely distinct from cascaded quantum systems.
  arXiv  Detail & Related papers  (2022-03-17T15:34:40Z)
• Quasiprobability fluctuation theorem behind the spread of quantum information [10.640597124563614]
  We theoretically uncover the quantum fluctuation theorem behind the informational inequality. The fluctuation theorem quantitatively predicts the statistics of the underlying quantum process. We experimentally apply an interference-based method to measure the amplitudes composing the quasiprobability.
  arXiv  Detail & Related papers  (2022-01-02T17:45:50Z)
• Field moment expansion method for interacting Bosonic systems [0.22940141855172036]
  We introduce a numerical method that simulates quantum systems initially well approximated by mean field theory. We call this the field moment expansion method. We investigate the accuracy of the field moment expansion using a number of well studied quantum test problems.
  arXiv  Detail & Related papers  (2021-08-19T16:29:21Z)
• Quantum estimation of a time dependent perturbation [0.0]
  We analyze the estimation of a time dependent perturbation acting on a quantum system. We combine quantum measurement theory and classical filter theory into a time evolving hybrid quantum and classical trajectory.
  arXiv  Detail & Related papers  (2021-06-06T12:11:39Z)
• From a quantum theory to a classical one [117.44028458220427]
  We present and discuss a formal approach for describing the quantum to classical crossover. The method was originally introduced by L. Yaffe in 1982 for tackling large-$N$ quantum field theories.
  arXiv  Detail & Related papers  (2020-04-01T09:16:38Z)

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.