Effects of gravity on continuous-variable quantum key distribution

Pierini, Roberto

doi:10.1103/physrevd.98.125007

Cited by 10 publications

(7 citation statements)

References 28 publications

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“…Furthermore, the key rates of all the protocols become practically zero at sufficiently high channel loss. Our results are agreement with the previous works [60,73] ,…”

Section: Resultssupporting

confidence: 94%

“…Further, we demonstrate that the key rates are monotonic decreasing with the increasing of the channel losses lengths l. It should be noted the monotonic decrease of K with the increasing of the channel loss length l. Compared with the channel loss, the effects of excess noises on the key rate are almost negligible. This results are agreement with the previous works [60,73] , which demonstrates the validity of our method and results. Moreover, with the increase in the variance of the initial shared entangled state, the key rate has significantly increased.…”

Section: Discussionsupporting

confidence: 93%

“…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. Furthermore, from a theoretical point of view, Pierini provided a general method to investigate how noninertial motion affects the performance of various QKD protocols for continuous-variable localized Gaussian states and stated that his results can be applied to the gravitational field according to the equivalence principle [60] .…”

Section: Introductionmentioning

confidence: 99%

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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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“…Furthermore, the key rates of all the protocols become practically zero at sufficiently high channel loss. Our results are agreement with the previous works [60,73] ,…”

Section: Resultssupporting

confidence: 94%

Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Liu¹,

Cao²,

Zhang³

et al. 2022

Preprint

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show abstract

“…[402]. Lastly, other relevant effects for all long-range space-based QKD protocols include space-time curvature [455] and gravity [456].…”

Section: Quantum Key Distributionmentioning

confidence: 99%

Quantum Physics in Space

Belenchia,

Carlesso,

Bayraktar

et al. 2021

Preprint

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Advances in quantum technologies are giving rise to a revolution in the way fundamental physics questions are explored at the empirical level. At the same time, they are the seeds for future disruptive technological applications of quantum physics. Remarkably, a space-based environment may open many new avenues for exploring and employing quantum physics and technologies. Recently, space missions employing quantum technologies for fundamental or applied studies have been proposed and implemented with stunning results.The combination of quantum physics and its space application is the focus of this review: we cover both the fundamental scientific questions that can be tackled with quantum technologies in space and the possible implementation of these technologies for a variety of academic and commercial purposes.

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“…satellites, airplanes, submersibles [1][2][3], requires the optical beam not only traverses through a medium, but in a few cases also in the fabric of the spacetime geometry, where general relativistic effects manifest [5][6][7][8]. Effects associated to the change of the geodesic due to a mass distribution, such as Shapiro time-delay [9], gravitational lensing [10], and frame dragging [11], are well-studied and observed [12][13][14][15][16][17]. Here, we explore the propagation of wavepackets along an arbitrary geodesic in a general curved spacetime geometry.…”

mentioning

confidence: 99%

Towards Communication in a Curved Spacetime Geometry

Exirifard,

Culf,

Karimi

2020

Preprint

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The current race in quantum communication, endeavouring to establish a global quantum network, must account for special and general relativistic effects. For example, Shapiro time-delay, gravitational lensing, and frame dragging -all due to how a mass distribution alters geodesics -are well-studied. Here, we report how the curvature of spacetime geometry affects the propagation of information carriers along an arbitrary geodesic. An explicit expression for the distortion onto the carrier wavefunction in terms of the Riemann curvature is obtained. Furthermore, we investigate this distortion for anti de Sitter and Schwarzschild geometries. For instance, the spacetime curvature causes a 0.11 radian phaseshift for communication between Earth and the International Space Station on a monochromatic laser beam as well as quadrupole astigmatism, which causes 13.4% crosstalk among the modes, when structured modes traverse through the solar system. Our finding shows that this gravitational distortion is significant, and it needs to be either pre-or post-corrected at the sender or receiver to retrieve the information.

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Effects of gravity on continuous-variable quantum key distribution

Cited by 10 publications

References 28 publications

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

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

Quantum Physics in Space

Towards Communication in a Curved Spacetime Geometry

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