Quantum coherence of a circularly accelerated atom in a spacetime with a reflecting boundary

Zhang, Wanhe; Liu, Xiaobao; Yang, Tingli

doi:10.1038/s41598-022-16647-9

Cited by 3 publications

(1 citation statement)

References 49 publications

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“…In addition, numerous ideas have studied the dynamics of quantum coherence for an accelerated atom. They include topics such as quantum coherence for an accelerated atom immersed in an electromagnetic field [13,14], entanglement harvesting [15][16][17], relativistic quantum computing [18,19], quantum communication [20,21], relativistic quantum optics [22], etc. This research has both fundamental and practical applications.…”

Section: Introductionmentioning

confidence: 99%

Robustness of Wave–Particle Duality under Unruh Effect

Barros,

da Paz,

Neto

et al. 2023

Entropy

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By considering a uniformly accelerated two-level system in an initial superposition state of a qubit, we investigate the loss of coherence induced by the acceleration. In addition, we investigate the impact of acceleration on the complementarity relation in a quantum interferometric circuit or quantum scattering circuit. We present an alternative approach to exploring acceleration effects through examination of quantum coherence decay and degradation in the interference pattern. Our investigations help to provide understanding of the consequences of decoherence induced by the Unruh effect on the wave–particle duality of a uniformly accelerated qubit.

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Section: Introductionmentioning

confidence: 99%

Robustness of Wave–Particle Duality under Unruh Effect

Barros,

da Paz,

Neto

et al. 2023

Entropy

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Dispersive vacuum as a decoherence amplifier of an Unruh–DeWitt detector

Barros,

Costa

2024

J. Phys. A: Math. Theor.

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Recently, interest has been growing in studies on discrete or "pixelated'' space-time that, through modifications in the dispersion relation, can treat the vacuum as a dispersive medium. Discrete spacetime considers that spacetime has a cellular structure on the order of the Planck length, and if this is true we should certainly have observable effects. In this paper, we investigated the effects caused by the dispersive vacuum on the decoherence process of an Unruh-DeWitt detector, our setup consists of a uniformly accelerated detector, initially in a qubit state, which interacts with a massless scalar field during a time interval finite. We use dispersion relations drawn from doubly special relativity and Hořava-Lifshitz gravity, with these modifications the vacuum becomes dispersive and has a corresponding refractive index. We calculate the probability transition rates, the probability of finding the detector in the ground state, and the quantum coherence variation. Our results indicate that the decoherence process occurs more quickly in cases with changes in the dispersion relation in the regime of high accelerations and interaction time. Additionally, the decoherence increases as the vacuum becomes more dispersive due to the increase in the order of modification in the dispersion relation, and this happens because the dispersive vacuum amplifies the effects of quantum fluctuations that are captured by the detector when interacting with the field.

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Detecting gravitational waves via coherence degradation induced by the Unruh effect

Barros,

Costa

2024

Eur. Phys. J. C

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We investigate the effects of a gravitational wave background on the coherence degradation induced by the Unruh effect of a uniformly accelerated single-qubit and quantum interferometric circuit. In both systems, we use the formalism of the evolution of the density matrix of the detector-field system, where after the interaction the field degrees of freedom are traced out to obtain the reduced density matrix of the detector. In this background, we calculate the quantum coherence and interferometric visibility in the long-wavelength regime and large interaction time. Our results indicate that the gravitational wave transfers energy to the internal states of the detector, causing, together with the Unruh effect, changes in them, amplifying the coherence degradation of the system. This amplification occurs when the polarization modes of the gravitational wave are in resonance and have modulated amplitudes. For the case of a short-wavelength, the detector does not respond to the gravitational wave because its oscillation is so fast that the detector does not have time to respond within the system timescale. Therefore, it is possible to detect the signature of gravitational waves in the coherence degradation induced by the Unruh effect within the regimes studied here.

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Quantum coherence of a circularly accelerated atom in a spacetime with a reflecting boundary

Cited by 3 publications

References 49 publications

Robustness of Wave–Particle Duality under Unruh Effect

Robustness of Wave–Particle Duality under Unruh Effect

Dispersive vacuum as a decoherence amplifier of an Unruh–DeWitt detector

Detecting gravitational waves via coherence degradation induced by the Unruh effect

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