Temporal Modes of Light in Satellite-to-Earth Quantum Communications

Wang, Ziqing; Malaney, Robert; Aguinaldo, Ryan

doi:10.1109/lcomm.2021.3130895

Cited by 6 publications

(7 citation statements)

References 24 publications

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“…We also denote the mean photon number per signal pulse, the central wavelength, the single-photon transmissivity, the detector dark count probability per signal pulse, and the optical misalignment error of the detection system as μ, λ 0 , η, P dark , and e mis , respectively. Unless otherwise specified, we set w 0 = 15 cm (following [16,18]), λ 0 = 1064 nm (following [16,18]), and P dark = 10 −6 (following [25]).…”

Section: System Modelmentioning

confidence: 99%

“…• We assume that weak coherent pulses are used as signal pulses, and we assume that the photon number of the signal pulses follows a Poisson distribution. We assume that TM-encoded RRDPS QKD uses Hermite-Gaussian (HG) temporal modes 2 (for detailed descriptions of these HG modes, one can refer to our previous work [18]). • We assume a unit efficiency for quantum state preparation.…”

Section: General Assumptionsmentioning

confidence: 99%

“…where (• , •) is the (upper) incomplete Gamma function. The quantity d 2 in the above equation represents the largest OAM number that should be used in d-dimensional OAM RRDPS QKD in order to give the highest transmissivity [18].…”

Section: Channel Lossmentioning

confidence: 99%

“…Until now we have been setting the beam-waist radius to w 0 = 15 cm following our previous works [16,18]. Despite not being unreasonably large, such a beam-waist radius is in fact larger than most of the used values in the existing implementations of satellite-based QKD.…”

Section: = 200 Km W 0 = 5 CMmentioning

confidence: 99%

“…As the natural extension of the conventional BB84 protocol, high-dimensional BB84 protocols can be achieved by encoding more than one bit of information per single photon. Extensive efforts have been devoted toward the use of time bins (e.g., [13,14]), OAM (e.g., [15,16]), and TMs (e.g., [17,18]) of single photons in high-dimensional BB84 protocols. Another class of high-dimensional QKD protocols encodes only one bit of information per single photon, and the benefit of an enhanced error tolerance comes with the reduction in the transmitted information.…”

Section: Introductionmentioning

confidence: 99%

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Performance analysis of inter-satellite round-robin differential-phase-shift quantum key distribution

Wang

Malaney

2022

Quantum Inf Process

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As the vision of global-scale unconditional information security becomes gradually realized, the importance of inter-satellite quantum communications has been rapidly increasing. The recently proposed round-robin differential-phase-shift (RRDPS) quantum key distribution (QKD) protocol has attracted much attention not only due to its potential high error tolerance, but also due to its distinct feature that the information leakage can be bounded without monitoring signal disturbances. Despite many existing implementations over fiber-optic channels, the feasibility of RRDPS QKD over an inter-satellite channel is still unknown. Moreover, despite the current advances in orbital angular momentum (OAM) encoding and temporal mode (TM) encoding, most of the existing studies on RRDPS QKD are restricted to time-bin encoding. In this work, we remedy this situation by exploring the feasibility of performing RRDPS QKD using OAM encoding and TM encoding over an inter-satellite channel. Our results indicate that OAM encoding is preferable to time-bin encoding only under the circumstances where a low dimension and a large receiver aperture are used. However, we find that TM encoding is the best encoding scheme in RRDPS QKD over an inter-satellite channel. In particular, we show that TM encoding not only leads to the best performance and the largest feasible parameter range, but also, for the first time, enables all the theoretically available advantages of an increased dimension to be realized in the context of RRDPS QKD.

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Section: System Modelmentioning

confidence: 99%

Section: General Assumptionsmentioning

confidence: 99%

Section: Channel Lossmentioning

confidence: 99%

Section: = 200 Km W 0 = 5 CMmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance analysis of inter-satellite round-robin differential-phase-shift quantum key distribution

Wang

Malaney

2022

Quantum Inf Process

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Unified and vector theory of Raman scattering in gas-filled hollow-core fiber across temporal regimes

Chen,

Wise

2024

APL Photonics

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Raman scattering has found renewed interest owing to the development of gas-filled hollow-core fibers, which constitute a unique platform for exploration of novel ultrafast nonlinear phenomena beyond conventional solid-core-fiber and free-space systems. Much progress has been made through models for particular interaction regimes, which are delineated by the relation of the excitation pulse duration to the time scales of the Raman response. However, current experimental settings are not limited to one regime, prompting the need for tools spanning multiple regimes. Here, we present a theoretical framework that accomplishes this goal. The theory allows us to review recent progress with a fresh perspective, makes new connections between distinct temporal regimes of Raman scattering, and reveals new degrees of freedom for controlling Raman physics. Specific topics that are addressed include transient Raman gain, the interplay of electronic and Raman nonlinearities in short-pulse propagation, and interactions of short pulses mediated by phonon waves. The theoretical model also accommodates vector effects, which have been largely neglected in prior works on Raman scattering in gases. The polarization dependence of transient Raman gain and vector effects on pulse interactions via phonon waves is investigated with the model. Throughout this Perspective, theoretical results are compared to the results of realistic numerical simulations. The numerical code that implements the new theory is freely available. We hope that the unified theoretical framework and numerical tool described here will accelerate the exploration of new Raman-scattering phenomena and enable new applications.

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Classical-quantum dual encoding for laser communications in space

Winnel,

Wang,

Malaney

et al. 2024

New J. Phys.

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In typical laser communications classical information is encoded by modulating the amplitude of the laser beam and measured via direct detection. We add a layer of security using quantum physics to this standard scheme, applicable to free-space channels. We consider a simultaneous classical-quantum communication scheme where the classical information is encoded in the usual way and the quantum information is encoded as fluctuations of a sub-Poissonian noise-floor. For secret key generation, we consider a continuous-variable quantum key distribution protocol (CVQKD) using a Gaussian ensemble of squeezed states and direct detection. Under the assumption of passive attacks secure key generation and classical communication can proceed simultaneously. Compared with standard CVQKD. which is secure against unrestricted attacks, our added layer of quantum security is simple to implement, robust and does not affect classical data rates. We perform detailed simulations of the performance of the protocol for a free-space atmospheric channel. We analyse security of the CVQKD protocol in the composable finite-size regime.

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Temporal Modes of Light in Satellite-to-Earth Quantum Communications

Cited by 6 publications

References 24 publications

Performance analysis of inter-satellite round-robin differential-phase-shift quantum key distribution

Performance analysis of inter-satellite round-robin differential-phase-shift quantum key distribution

Unified and vector theory of Raman scattering in gas-filled hollow-core fiber across temporal regimes

Classical-quantum dual encoding for laser communications in space

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