Provably secure and high-rate quantum key distribution with time-bin qudits

Islam, Nurul T.; Lim, Charles Ci Wen; Cahall, Clinton; Kim, Jungsang; Gauthier, Daniel J.

doi:10.1126/sciadv.1701491

Cited by 272 publications

(218 citation statements)

References 45 publications

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“…The interferometer demonstrates single-mode interference visibility V SM = 99.02 ± 0.05 % and multi-mode interference visibility V MM = 98.38 ± 0.01 % extracted from the fitted functions. The single-mode results are close to those reported by high-performing commercial interferometers such as those used in a recent QKD demonstration [3,11]. Additionally, the multi-mode results presented here are significantly better than those recently reported for multi-mode interferometers [5,6].…”

Section: A Fringe Visibilitysupporting

confidence: 86%

“…One significant challenge of establishing a free-space optical link is the distortion of the spatial mode of the beam at the receiver due to atmospheric turbulence. A freespace quantum communication scheme, such as quantum key distribution (QKD) using a time-phase encoding [2,3], requires a time-delay interferometer designed to support many spatial modes to perform measurements in the phase-basis.…”

Section: Introductionmentioning

confidence: 99%

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Multimode Time-Delay Interferometer for Free-Space Quantum Communication

et al. 2020

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Quantum communication schemes such as quantum key distribution (QKD) and superdense teleportation provide unique opportunities to communicate information securely. Increasingly, optical communication is being extended to free-space channels, but atmospheric turbulence in free-space channels requires optical receivers and measurement infrastructure to support many spatial modes.Here we present a multi-mode, Michelson-type time-delay interferometer using a field-widened design for the measurement of phase-encoded states in free-space communication schemes. The interferometer is constructed using glass beam paths to provide thermal stability, a field-widened angular tolerance, and a compact footprint. The performance of the interferometer is highlighted by measured visibilities of 99.02 ± 0.05 %, and 98.38 ± 0.01 % for single-and multi-mode inputs, respectively. Additionally, high quality multi-mode interference is demonstrated for arbitrary spatial mode structures and for temperature changes of ±1.0 • C. The interferometer has a measured optical path-length drift of 130 nm/ • C near room temperature. With this setup, we demonstrate the measurement of a two-peaked, multi-mode, single-photon state used in time-phase QKD with a visibility of 97.37 ± 0.01 %.

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Section: A Fringe Visibilitysupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Multimode Time-Delay Interferometer for Free-Space Quantum Communication

et al. 2020

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“…Figure 3 summarizes the time-encoding schemes we have discussed. Time encoding has been exploited in a large number of experiments, mostly focused on quantum communication and quantum cryptography [48,[123][124][125][126].…”

Section: Bulk Optics Schemesmentioning

confidence: 99%

High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges

et al. 2019

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In recent years, there has been a rising interest in high‐dimensional quantum states and their impact on quantum communication. Indeed, the availability of an enlarged Hilbert space offers multiple advantages, from larger information capacity and increased noise resilience, to novel fundamental research possibilities in quantum physics. Multiple photonic degrees of freedom have been explored to generate high‐dimensional quantum states, both with bulk optics and integrated photonics. Furthermore, these quantum states have been propagated through various channels, for example, free‐space links, single‐mode, multicore, and multimode fibers, and also aquatic channels, experimentally demonstrating the theoretical advantages over 2D systems. Here, the state‐of‐the‐art on the generation, propagation, and detection of high‐dimensional quantum states is reviewed. Quantum communication with states living in d‐dimensional Hilbert spaces, qudits, yields great benefits. However, qudits generation, transmission, and detection is not a simple task to accomplish. This review presents the state‐of‐the‐art on the generation, propagation, and measurement of high‐dimensional quantum states, highlighting their advantages, issues, and future perspectives.

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“…Several methods of high-dimensional QKD have been demonstrated, including time-bin [19][20][21][22], orbital angular-momentum [23][24][25][26] and transverse momentum [27,28]. Comparing the last two spatial encoding schemes, transverse momentum states have the following advantages.…”

Section: Introductionmentioning

confidence: 99%

Large-alphabet quantum key distribution using spatially encoded light

Tentrup

Luiten²,

Meer

et al. 2019

New J. Phys.

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Most quantum key distribution protocols using a two-dimensional basis, such as HV polarization as first proposed by Bennett and Brassard in 1984, are limited to a key generation density of 1 bit per photon. We increase this key density by encoding information in the transverse spatial displacement of the used photons. Employing this higher-dimensional Hilbert space together with modern singlephoton-detecting cameras, we demonstrate a proof-of-principle large-alphabet quantum key distribution experiment with 1024 symbols and a shared information between sender and receiver of 7bit per photon.

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Provably secure and high-rate quantum key distribution with time-bin qudits

Abstract: Information encoded in high-dimensional quantum states can achieve ultrahigh rates over metropolitan distances.

Cited by 272 publications

References 45 publications

Multimode Time-Delay Interferometer for Free-Space Quantum Communication

Multimode Time-Delay Interferometer for Free-Space Quantum Communication

High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges

Large-alphabet quantum key distribution using spatially encoded light

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