Schrödinger cats coupled with cavities losses: the effect of finite and structured reservoirs

• URL: http://arxiv.org/abs/2406.17696v1
• Date: Tue, 25 Jun 2024 16:33:02 GMT
• Title: Schrödinger cats coupled with cavities losses: the effect of finite and structured reservoirs
• Authors: J. Lira, L. Sanz,
• Abstract summary: We discuss the generation of a Schr"odinger cat in a nanocavity created by the coupling of an electromagnetic mode with an exciton in a quantum dot. More than the generation itself, we focus on the effects of the environment over the bosonic state in the nanocavity.
• Score: 0.0
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: We discuss the generation of a Schr\"odinger cat in a nanocavity created by the coupling of an electromagnetic mode with an exciton in a quantum dot considering the dispersive limit of the Jaynes-Cummings model. More than the generation itself, we focus on the effects of the environment over the bosonic state in the nanocavity, which has losses simulated by coupling with two different kind of reservoirs. In the first case, the interaction between the system with a finite reservoir shows that fragments of different sizes of the reservoir deliver the same amount of information about the physical system in the dynamics of the birth and death of the Schr\"odinger cat. The second case considers a structured reservoir, whose spectral density varies significantly with frequency. This situation becomes relevant in solid-state devices where quantum channels are embedded, as memory effects generally cannot be neglected. Under these circumstances, it is observed that the dynamics can differ substantially from the Markovian, presenting oscillations related to the average number of photons. These oscillations influence the information flow between the system and the environment, evidenced here by the measurement of non-Markovianity.

Related papers

• 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)
• Nonreciprocal Generation of Schr\"{o}dinger Cat State Induced by Topology [16.939175598826477]
  We explore the interplay between quantum nonreciprocity and topology in a one-dimensional microcavity array. We obtain the Schr"odinger cat state in a chosen direction at the edge cavity, whereas a it classical state in the other direction. The obtained cat state has nonreciprocal high fidelity, nonclassicality, and quantum coherence.
  arXiv  Detail & Related papers  (2023-12-16T13:30:11Z)
• Entanglement preservation in tripartite quantum systems under dephasing dynamics [0.0]
  We investigate the tripartite entanglement dynamics of pure and mixed states in the presence of a structured dephasing environment at finite temperature. We show that the robustness of the quantum system to decoherence is dependent on the distribution of entanglement. The sustainability of tripartite entanglement is shown to be enhanced significantly in presence of reservoir memory.
  arXiv  Detail & Related papers  (2023-11-09T06:19:08Z)
• Dissipative stabilization of maximal entanglement between non-identical emitters via two-photon excitation [49.1574468325115]
  Two non-identical quantum emitters, when placed within a cavity and coherently excited at the two-photon resonance, can reach stationary states of nearly maximal entanglement. We show that this mechanism is merely one among a complex family of phenomena that can generate both stationary and metastable entanglement when driving the emitters at the two-photon resonance.
  arXiv  Detail & Related papers  (2023-06-09T16:49:55Z)
• Quantifying measurement-induced quantum-to-classical crossover using an open-system entanglement measure [49.1574468325115]
  We study the entanglement of a single particle under continuous measurements. We find that the entanglement at intermediate time scales shows the same qualitative behavior as a function of the measurement strength.
  arXiv  Detail & Related papers  (2023-04-06T09:45:11Z)
• Evolution of many-body systems under ancilla quantum measurements [58.720142291102135]
  We study the concept of implementing quantum measurements by coupling a many-body lattice system to an ancillary degree of freedom. We find evidence of a disentangling-entangling measurement-induced transition as was previously observed in more abstract models.
  arXiv  Detail & Related papers  (2023-03-13T13:06:40Z)
• Discord and Decoherence [0.0]
  We investigate how quantum discord is modified by a quantum-to-classical transition. We find that the evolution of quantum discord in presence of an environment is a competition between the growth of the squeezing amplitude and the decrease of the state purity.
  arXiv  Detail & Related papers  (2021-12-09T17:01:54Z)
• 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)
• Quantum entanglement between excitons in two-dimensional materials [0.0]
  The quantum entanglement between two excitons in two-dimensional materials, embedded in an optical microcavity, was investigated. The energy eigenstates of a Jaynes-Cummings like Hamiltonian for two qubits coupled to a single cavity mode have been calculated.
  arXiv  Detail & Related papers  (2021-12-06T14:17:03Z)
• Entropic bounds on information backflow [0.0]
  We exploit a regularized version of Umegaki's quantum relative entropy, known as telescopic relative entropy, that is tightly connected to the quantum Jensen-Shannon divergence. We derive general upper bounds on the telescopic relative entropy revivals conditioned and determined by the formation of correlations and changes in the environment.
  arXiv  Detail & Related papers  (2021-01-07T19:00:30Z)
• Correlations transference and apparition of a metastable decoherence-free subspace in dissipative reservoirs [0.0]
  We study the dynamic of correlations in a system composed of a two-mode quantum field and the environment. We show that under the onset of decoherence, correlations in the quantum field are not lost but transferred to the environment.
  arXiv  Detail & Related papers  (2021-01-05T02:40:49Z)

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.