Coherence behavior of strongly coupled bosonic modes

• URL: http://arxiv.org/abs/2208.10649v1
• Date: Mon, 22 Aug 2022 23:33:30 GMT
• Title: Coherence behavior of strongly coupled bosonic modes
• Authors: Jucelino F. Sousa, Carlos H. S. Vieira, Jonas F. G. Santos, and Irismar G. da Paz
• Abstract summary: We study the effect of the intermode coupling in the generation of coherence when two bosonic modes are bilinearly coupled. We observe that the intermode coupling induces oscillations in the coherence and fidelity dynamics similar to the behavior for the coupling with a non-Markovian environment.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: We study the effect of the intermode coupling in the generation of coherence when two bosonic modes are bilinearly coupled. We consider the case for which the two modes are weakly coupled and the rotating-wave approximation (RWA) applies and the case for which they are strongly coupled and the (RWA) does not apply. Then, in the regime of validity of (RWA), there is no coherence generation solely due to squeezing effects, which means there is an exchange of excitation between the modes and negligible squeezing. On the other hand, if the two modes are strongly coupled coherence is generated by the squeezing interaction. For the system of two bosonic modes weakly coupled with a Markovian bath at temperature $T$ the coherence decreases with $T$. In general, when both kinds of couplings (exchange of excitation and squeezing) are turned on the exchange of excitation contributes to generating more coherence in comparison with a purely squeezing coupling. Thus, the coherence decreases more slowly with the temperature when both couplings are present. Finally, we explore the case when only one of the two coupled modes interacts with a Markovian bath while the other one remains free from the environment. We observe that the intermode coupling induces oscillations in the coherence and fidelity dynamics similar to the behavior for the coupling with a non-Markovian environment.

Related papers

• Non-Markovianity in a dressed qubit with local dephasing [0.0]
  We study the dynamics of a dressed qubit implemented by a spinless fermion hopping between two lattice sites with each site strongly coupled to a bath of phonons.<n>Applying time-convolutionless master equation within the polaron frame, we investigate decoherence dynamics of the dressed qubit.
  arXiv  Detail & Related papers  (2026-02-07T08:38:15Z)
• Two-tooth bosonic quantum comb for temporal-correlation sensing [39.391428786947685]
  We introduce a two-tooth bosonic quantum comb that captures the sequential interactions between a thermal absorber and a long-lived coherent probe.<n>The comb provides a causal, multi-time description of coherence transport, tracking how the probe records both instantaneous fluctuations and their temporal correlations.
  arXiv  Detail & Related papers  (2026-01-16T00:16:51Z)
• Nonreciprocal flow of fluctuations, populations and correlations between doubly coupled bosonic modes [0.0]
  We show that the dynamics of the quadrature components of the field operators can be attributed to non-Hermicity of the system.<n>In particular, we identify how the emerging exceptional point controls the conversion of thermal states of the modes into single-mode classically or quantum squeezed states.
  arXiv  Detail & Related papers  (2025-12-12T10:15:46Z)
• Collisional model with dissipative and dephasing baths: Nonadditive effects at strong coupling [39.146761527401424]
  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.
  arXiv  Detail & Related papers  (2025-09-13T21:37:43Z)
• Coupling phase enabled level transitions in pseudo-Hermitian magnon-polariton systems [0.0]
  We propose a pseudo-Hermitian model with two magnon and two cavity modes coupled via phase-dependent interaction.<n>We link the energy spectrum to phase transitions, observing exceptional points when pseudo-Hermitian symmetry breaks.
  arXiv  Detail & Related papers  (2025-08-06T10:34:35Z)
• Heat transport through an open coupled scalar field theory hosting stability-to-instability transition [1.96076686350775]
  We study heat transport through a one-dimensional open coupled scalar field theory. In this work, we engineer a unique bath coupling where a single bath is connected to two fields at each edge with the same strength. We derive analytical expressions for high-temperature classical heat current through the network for different bath couplings at the edges and compare them.
  arXiv  Detail & Related papers  (2024-02-07T16:03:36Z)
• 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)
• Unconditional Wigner-negative mechanical entanglement with linear-and-quadratic optomechanical interactions [62.997667081978825]
  We propose two schemes for generating Wigner-negative entangled states unconditionally in mechanical resonators. We show analytically that both schemes stabilize a Wigner-negative entangled state that combines the entanglement of a two-mode squeezed vacuum with a cubic nonlinearity. We then perform extensive numerical simulations to test the robustness of Wigner-negative entanglement attained by approximate CPE states stabilized in the presence of thermal decoherence.
  arXiv  Detail & Related papers  (2023-02-07T19:00:08Z)
• An error-protected cross-resonance switch in weakly-tuneable architectures [0.8702432681310399]
  In two-qubit gates activated by microwave pulses, state of qubits are swapped between entangled or idle modes. In either mode, the presence of stray couplings makes qubits accumulate coherent phase error. We propose to combine such a gate with a tunable coupler and show that both idle and entangled qubits can become free from stray couplings.
  arXiv  Detail & Related papers  (2022-12-11T14:50:41Z)
• Generation and transfer of entangled states between two connected microtoroidal cavities: analysis of different types of coupling [0.0]
  We investigate the generation and transfer of entangled states between two coupled microtoroidal cavities. The cavities support two counter-propagating whispering-gallery modes (WGMs) that may also interact with each other.
  arXiv  Detail & Related papers  (2022-09-30T17:59:47Z)
• 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)
• Dynamic Transport Characteristics of Side-Coupled Double Quantum-Impurity Systems [3.9150069025045164]
  Transport current behaves like a single quantum dot when the coupling strength is low during or coulomb coupling. The amplitude of the current oscillation exists in positive correlation with $W$ and negative correlation with $U$.
  arXiv  Detail & Related papers  (2021-12-16T03:28:35Z)
• Geometric phase in a dissipative Jaynes-Cummings model: theoretical explanation for resonance robustness [68.8204255655161]
  We compute the geometric phases acquired in both unitary and dissipative Jaynes-Cummings models. In the dissipative model, the non-unitary effects arise from the outflow of photons through the cavity walls. We show the geometric phase is robust, exhibiting a vanishing correction under a non-unitary evolution.
  arXiv  Detail & Related papers  (2021-10-27T15:27:54Z)
• Quantum asymmetry and noisy multi-mode interferometry [55.41644538483948]
  Quantum asymmetry is a physical resource which coincides with the amount of coherence between the eigenspaces of a generator. We show that the asymmetry may emphincrease as a result of a emphdecrease of coherence inside a degenerate subspace.
  arXiv  Detail & Related papers  (2021-07-23T07:30:57Z)
• Superconducting coupler with exponentially large on-off ratio [68.8204255655161]
  Tunable two-qubit couplers offer an avenue to mitigate errors in multiqubit superconducting quantum processors. Most couplers operate in a narrow frequency band and target specific couplings, such as the spurious $ZZ$ interaction. We introduce a superconducting coupler that alleviates these limitations by suppressing all two-qubit interactions with an exponentially large on-off ratio.
  arXiv  Detail & Related papers  (2021-07-21T03:03:13Z)
• Distant emitters in ultrastrong waveguide QED: Ground-state properties and non-Markovian dynamics [0.0]
  We study the properties of a system of two distant two-level emitters coupled to a one-dimensional Ohmic waveguide. We introduce non-Markovianity arising from delay-feedback effects in two distant emitters in the so-called ultrastrong coupling regime. In particular, we revisit the Fermi two-atom problem showing that, in the USC regime, initial correlations yield two different evolutions for symmetric and antisymmetric states.
  arXiv  Detail & Related papers  (2021-06-05T19:21:00Z)
• Effect of inter-system coupling on heat transport in a microscopic collision model [21.9802187221101]
  We consider a bipartite system composed of two subsystems each coupled to its own thermal environment. We mainly study whether the approximation (i.e., the inter-system interaction is ignored when modeling the system-environment coupling) is valid or not.
  arXiv  Detail & Related papers  (2020-12-23T09:34:50Z)
• Parallel dark soliton pair in a bistable 2D exciton-polariton superfluid [47.187609203210705]
  2D dark solitons are unstable and collapse into vortices due to snake instabilities. We demonstrate that a pair of dark solitons can be formed in the wake of an obstacle in a polariton flow resonantly supported by a homogeneous laser beam.
  arXiv  Detail & Related papers  (2020-03-25T13:52:22Z)
• Switching dynamics of single and coupled VO2-based oscillators as elements of neural networks [55.41644538483948]
  We report on the switching dynamics of both single and coupled VO2-based oscillators, with resistive and capacitive coupling, and explore the capability of their application in neural networks. For the resistive coupling, it is shown that synchronization takes place at a certain value of the coupling resistance, though it is unstable and a synchronization failure occurs periodically. For the capacitive coupling, two synchronization modes, with weak and strong coupling, are found. The transition between these modes is accompanied by chaotic oscillations.
  arXiv  Detail & Related papers  (2020-01-07T02:16:04Z)

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.