Handheld Quantum Key Distribution

Mélen, Gwenaëlle; Freiwang, Peter; Luhn, Jannik; Vogl, Thomas; Rau, Markus; Sonnleitner, Clemens; Rosenfeld, Wenjamin; Weinfurter, Harald

doi:10.1364/qim.2017.qt6a.57

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…These type of QKD setups are designed for future daily-life applications, for example with mobile devices (see e.g. [44][45][46]).…”

Section: Discussionmentioning

confidence: 99%

Practical quantum tokens without quantum memories and experimental tests

Kent,

Lowndes,

Pitalúa-García

et al. 2021

Preprint

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Unforgeable quantum money tokens were the first invention of quantum information science, but remain technologically challenging as they require quantum memories and/or long distance quantum communication. More recently, virtual "S-money" tokens were introduced. These are generated by quantum cryptography, do not require quantum memories or long distance quantum communication, and yet in principle guarantee many of the security advantages of quantum money. Here, we describe implementations of S-money schemes with off-the-shelf quantum key distribution technology, and analyse security in the presence of noise, losses, and experimental imperfection. Our schemes satisfy near instant validation without cross-checking. We show that, given standard assumptions in mistrustful quantum cryptographic implementations, unforgeability and user privacy could be guaranteed with attainable refinements of our off-the-shelf setup. We discuss the possibilities for unconditionally secure (assumption-free) implementations.

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“…These type of QKD setups are designed for future daily-life applications, for example with mobile devices (see e.g. [44][45][46]).…”

Section: Discussionmentioning

confidence: 99%

Practical quantum tokens without quantum memories and experimental tests

Kent,

Lowndes,

Pitalúa-García

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

Practical quantum tokens without quantum memories and experimental tests

et al. 2022

View full text Add to dashboard Cite

Unforgeable quantum money tokens were the first invention of quantum information science, but remain technologically challenging as they require quantum memories and/or long-distance quantum communication. More recently, virtual “S-money” tokens were introduced. These are generated by quantum cryptography, do not require quantum memories or long-distance quantum communication, and yet in principle guarantee many of the security advantages of quantum money. Here, we describe implementations of S-money schemes with off-the-shelf quantum key distribution technology, and analyse security in the presence of noise, losses, and experimental imperfection. Our schemes satisfy near-instant validation without cross-checking. We show that, given standard assumptions in mistrustful quantum cryptographic implementations, unforgeability and user privacy could be guaranteed with attainable refinements of our off-the-shelf setup. We discuss the possibilities for unconditionally secure (assumption-free) implementations.

show abstract

Theoretical development of discrete-modulated continuous-variable quantum key distribution

Liu

Li²,

Liu³

et al. 2022

Front. Quantum Sci. Technol.

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Continuous-variable quantum key distribution offers simple, stable and easy-to-implement key distribution systems. The discrete modulation scheme further reduces the technical difficulty. The main regret is that the security of discrete modulation schemes has not been sufficiently demonstrated. Schemes with different signal state distributions use various physical conditions to obtain the key rate formula, resulting in different security levels, computation complexities and implementation difficulties. Therefore, a relatively systematic and logically consistent security proof against most general attacks is worth exploring. On the other hand, extending the discrete modulation scheme and its variants to different applications, such as satellite-to-earth communication, can further activate and advance this field. Here, we briefly review the achievements that have been made in discrete-modulated continuous-variable quantum key distribution, and openly discuss some issues worthy of further research.

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Handheld Quantum Key Distribution

Cited by 3 publications

References 7 publications

Practical quantum tokens without quantum memories and experimental tests

Practical quantum tokens without quantum memories and experimental tests

Practical quantum tokens without quantum memories and experimental tests

Theoretical development of discrete-modulated continuous-variable quantum key distribution

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