Decoherence of a solid-state qubit by different noise correlation spectra

Villar, Paula I.; Lombardo, Fernando C.

doi:10.1016/j.physleta.2014.11.022

Cited by 9 publications

(7 citation statements)

References 30 publications

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“…They have focused on the effect of longitudinal and transversal noise on the superconducting qubit's dynamics and shown that the decoherence can be understood as fluctuations in the Bloch vector induced by noise. Since decoherence rate depends on the state of the qubit, we have represented decoherence by the change of R in time, starting from |R| = 1 for the initial pure state, and decreasing as long as the quantum state losses purity [50]. To our knowledge, however, the study of the physical quantum properties between a SC-qubit and quantized field under the effect of the time-dependent coupling in the presence of decoherence has not been previously addressed.…”

Section: Introductionmentioning

confidence: 99%

Effect of the time-dependent coupling on a superconducting qubit-field system under decoherence: Entanglement and Wehrl entropy

2015

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Section: Introductionmentioning

confidence: 99%

Effect of the time-dependent coupling on a superconducting qubit-field system under decoherence: Entanglement and Wehrl entropy

2015

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“…This means, in a general case, the phase is

ϕ_{g} = ϕ_{u} + δ ϕ

, where

δ ϕ

is the correction to the unitary phase induced by the presence of the environment. [ 44–49 ]…”

Section: Bodies In Relative Motion: Quantum Frictionmentioning

confidence: 99%

“…In the case of open quantum evolution, the geometric phase that the system acquires φ g differs from that acquired when the evolution is closed φ u [43] since it is now affected by non-unitary effects such as decoherence and dissipation. This means, in a general case, the phase is φ g = φ u + δφ, where δφ is the correction to the unitary phase induced by the presence of the environment [44][45][46][47][48][49].…”

Section: B Environmentally Motion-induced Decoherencementioning

confidence: 99%

Detectable Signature of Quantum Friction on a Sliding Particle in Vacuum

et al. 2021

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Spatially separated bodies in a relative motion through vacuum experience a tiny friction force known as quantum friction (QF). This force has so far eluded experimental detection due to its small magnitude and short range. Quantitative details revealing traces of the QF in the degradation of the quantum coherence of a particle are presented. Environmentally induced decoherence for a particle sliding over a dielectric sheet can be decomposed into contributions of different signatures: one solely induced by the electromagnetic vacuum in the presence of the dielectric and another induced by motion. As the geometric phase (GP) has been proved to be a fruitful venue of investigation to infer features of the quantum systems, herein it is proposed to use the accumulated GP acquired by a particle as a QF sensor. Furthermore, an innovative experiment designed to track traces of QF by measuring the velocity dependence of corrections to the GP and coherence is proposed. The experimentally viable scheme presented can spark renewed optimism for the detection of non‐contact friction, with the hope that this non‐equilibrium phenomenon can be readily measured soon.

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“…where the non-unitary effects are modeled by the velocity dependent diffusion coefficients D(v, t) and f (v, t), while dissipative effects are present in the corresponding ζ(v, t) [54][55][56][57][58][59][60][61][62][63]. We set the dimensionless quantity u = v/(aω pl ), which will be called the velocity from here on.…”

Section: Non-unitary Evolution Of the Systemmentioning

confidence: 99%

Towards detecting traces of non-contact quantum friction in the corrections of the accumulated geometric phase

et al. 2020

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The geometric phase can be used as a fruitful venue of investigation to infer features of the quantum systems. Its application can reach new theoretical frontiers and imply innovative and challenging experimental proposals. Herein, we take advantage of the geometric phase to sense the corrections induced while a neutral particle travels at constant velocity in front of an imperfect sheet in quantum vacuum. As it is already known, two bodies in relative motion at constant velocity experience a quantum contactless dissipative force, known as quantum friction. This force has eluded experimental detection so far due to its small magnitude and short range. However, we give details of an innovative experiment designed to track traces of the quantum friction by measuring the velocity dependence of corrections to the geometric phase. We notice that the environmentally induced corrections can be decomposed in different contributions: corrections induced by the presence of the dielectric sheet and the motion of the particle in quantum vacuum. As the geometric phase accumulates over time, its correction becomes relevant at a relative short timescale, while the system still preserves purity. The experimentally viable scheme presented would be the first one in tracking traces of quantum friction through the study of decoherence effects on a NV center in diamond.

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Decoherence of a solid-state qubit by different noise correlation spectra

Cited by 9 publications

References 30 publications

Effect of the time-dependent coupling on a superconducting qubit-field system under decoherence: Entanglement and Wehrl entropy

Effect of the time-dependent coupling on a superconducting qubit-field system under decoherence: Entanglement and Wehrl entropy

Detectable Signature of Quantum Friction on a Sliding Particle in Vacuum

Towards detecting traces of non-contact quantum friction in the corrections of the accumulated geometric phase

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