Handheld Quantum Key Distribution

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

doi:10.1364/cleo_qels.2018.ftu3g.1

Cited by 5 publications

(5 citation statements)

References 2 publications

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“…While mastering the basic protocol of DM-CV-QKD, its application range can be expanded according to its characteristics. It has the potential for communications in free-space channels (Hill et al, 2017;Mélen et al, 2017), satellite-to-earth channels (Liao et al, 2017a) and seawater channels (Ruan et al, 2019). In addition, MDI protocols against side-channel attacks and device-independent protocols with higher security are also worthy of further study.…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

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

Liu

Li²,

Liu³

et al. 2022

Front. Quantum Sci. Technol.

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show abstract

“…There exists many methods for aligning optical channels, previously we have used kinematic magnetic mounts (Newport M-BK-2A) [25] but these were large and unwieldy. Active beamsteering [20,26] is a compelling addition to the system but it adds extra complexity for an initial prototype device. For system simplicity, a 3D printed dock was designed.…”

Section: Receivermentioning

confidence: 99%

A low cost, short range quantum key distribution system

Lowndes

Frick

Hart

et al. 2021

EPJ Quantum Technol.

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We present a miniaturized quantum key distribution system, designed to augment the more mature quantum key distribution systems currently commercially available. Our device is designed for the consumer market, and so size, weight and power are more important than raw performance. To achieve our form factor, the transmitter is handheld and the receiver is a larger fixed terminal. We envisage users would bring their transmitters to centrally located receivers and exchange keys which they could use at a later point. Transmitting qubits at 80 MHz, the peak key rate is in excess of 20 kbps. The transmitter device fits within an envelope of <150 ml, weighs 65 g and consumes 3.15 W of power.

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“…Importantly, Bob's transmission device is small, hand-held, and low cost. These type of QKD setups are designed for future daily-life applications, for example with mobile devices (see e.g., [50][51][52] ).…”

Section: For K ∈ [N]mentioning

confidence: 99%

Practical quantum tokens without quantum memories and experimental tests

Pitalúa-García

Kent

Lowndes

et al. 2021

Quantum Technology: Driving Commercialisation of an Enabling Science II

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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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Handheld Quantum Key Distribution

Cited by 5 publications

References 2 publications

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

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

A low cost, short range quantum key distribution system

Practical quantum tokens without quantum memories and experimental tests

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