Quantum fluctuation of entanglement for accelerated two-level detectors*

Zhang, Si-Xuan; Liu, Tonghua; Cao, Shuo; Liu, Yuting; Geng, Shuaibo; Lian, Yujie

doi:10.1088/1674-1056/ab7d9a

Cited by 9 publications

(6 citation statements)

References 42 publications

(84 reference statements)

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“…The output field presents entanglement properties at multiple frequencies, which can effectively enhance the information carrying capacity of quantum communication systems. Our results have potential applications in fields of quantum information processing, [40,45] multi-channel EIT memory, [46] and quantum precision measurement, [47][48][49] etc.…”

Section: Discussionmentioning

confidence: 76%

Broadband multi-channel quantum noise suppression and phase-sensitive modulation based on entangled beam

Di 邸,

Tan 谈,

Cheng 程

et al. 2023

Chinese Phys. B

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We present a theoretical scheme for broadband multi-channel quantum noise suppression and phase-sensitive modulation of continuous variables in a coupled resonant system with quantum entanglement properties. The effects of different coupling strengths and pumping power in suppressing quantum noise and controlling the width of quantum interference channels are analyzed carefully. Furthermore, quantum noise suppression at quadrature amplitude is obtained with phase-sensitive modulation. It shows that the entanglement strength of the output field and the quantum noise suppression effect can be enhanced significantly by a strong pumping filed due to the interaction of the pumping light with the nonlinear crystal. The full width at half maxima (FWHM) of the noise curve at the resonant peak (Δ = 0 MHz) is broadened 2.17 times compared to the single cavity. In the strong coupling resonant system, the FWHM at Δ = 0 MHz (Δ = ±3.1 MHz) is also broadened 1.27 (3.53) times compared to the weak coupling resonant system case. The multi-channel quantum interference creates an electromagnetically-induced-transparent-like line shape (EIT-like), which can be used to improve the transmission efficiency and stability of wave packets in quantum information processing and quantum memory.

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Section: Discussionmentioning

confidence: 76%

Broadband multi-channel quantum noise suppression and phase-sensitive modulation based on entangled beam

Di 邸,

Tan 谈,

Cheng 程

et al. 2023

Chinese Phys. B

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“…[31] More related work on relativistic quantum information can be found in the literature. [32][33][34][35][36][37][38][39][40][41] In addition, some attempts have previously been made to perform experimental tests of quantum resources in relativistic coordinate systems, with the realization of photonic entanglement in an accelerated setting. [42] However, it is well known that one cannot get the full information from a global mode in the experiment, since the method of single mode approximation is delocalized in practice.…”

Section: Introductionmentioning

confidence: 99%

Relativistic motion on Gaussian quantum steering for two-mode localized Gaussian states

et al. 2022

Self Cite

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Realistic quantum systems always exhibit gravitational and relativistic features. In this paper, we investigate the properties of Gaussian steering and its asymmetry by the localized two-mode Gaussian quantum states, instead of the traditional single-mode approximation method in the relativistic setting. We find that the one-side Gaussian quantum steering will monotonically decrease with increasing observers of acceleration. Meanwhile, our results also reveal the interesting behavior of the Gaussian steering asymmetry, which increases for a specific range of accelerated parameter and then gradually approaches to a finite value. Such findings is well consistent and explained by the well-known Unruh effect, which could significantly destroy the one-side Gaussian quantum steering. Finally, our results could also be applied to the dynamical studies of Gaussian steering between the Earth and satellites, since the effects of acceleration is equal to the effects of gravity according to the equivalence principle.

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“…For instance, the work has investigated how relativistic acceleration affects the performance of quantum teleportation and dense coding for CV states of localized wave packets [40] . More works about relativistic acceleration or the Earth's gravity affect on quantum resources (entanglement, coherence and Gaussian Interference Power) and quantum information tasks, we refer readers to see refs [41][42][43][44][45][53][54][55][56][57][58][59] . From an experimental point of view, Pirandola et al proposed a fully operational satellite QKD system [15] , which means that their scheme paves the way toward the implementation of a quantum communication worldwide network leveraging existing receivers.…”

Section: Introductionmentioning

confidence: 99%

Satellite-based continuous-variable quantum key distribution under the Earth's gravitational field

Liu¹,

Cao²,

Zhang³

et al. 2022

Preprint

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Long distance communication protocols cannot ignore the existence of the Earth's gravitational field and its effects on quantum states. In this work, we show a very general method to consider the effects of the Earth's gravitational field on continuous-variable quantum key distribution protocols.Our results show that the Earth's gravitational field erodes the ability of the two parties to perform QKD in all the protocols. However, our findings also exhibit some interesting features, i.e., the key rates initially increase for a specific range of height parameter h ≃ r A /2 and then gradually decrease with the increasing of the orbits of satellite h. A possible explanation is also provided in our analysis, considering the fact that gravitational frequency shift and special relativistic effects play different roles in the key rates. In addition, our findings show that the change in key rate effected by gravitational frequency shift can be determined at a level of < 1.0% within the satellite height at geostationary Earth orbits. Our work could provide some interesting possibilities to reduce the loss key rate through the control of the orbital height of satellites.

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Quantum fluctuation of entanglement for accelerated two-level detectors*

Cited by 9 publications

References 42 publications

Broadband multi-channel quantum noise suppression and phase-sensitive modulation based on entangled beam

Broadband multi-channel quantum noise suppression and phase-sensitive modulation based on entangled beam

Relativistic motion on Gaussian quantum steering for two-mode localized Gaussian states

Satellite-based continuous-variable quantum key distribution under the Earth's gravitational field

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