Continuous-variable measurement-device-independent quantum key distribution: Composable security against coherent attacks

Lupo, Cosmo; Ottaviani, Carlo; Papanastasiou, Panagiotis; Pirandola, Stefano

doi:10.1103/physreva.97.052327

Cited by 98 publications

(92 citation statements)

References 40 publications

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“…Quite soon CV versions of MDI-QKD were proposed based on similar ideas of entanglement swapping [25][26][27]. These protocols have also been studied theoretically [28][29][30] and realized experimentally [25]. How-ever, the maximal transmission distances were found to be unsatisfactory as compared to DV-MDI-QKD.…”

Section: Introductionmentioning

confidence: 99%

Coherence-assisted non-Gaussian measurement-device-independent quantum key distribution

et al. 2019

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Non-Gaussian operations on two mode squeezed vacuum states (TMSV) in continuous variable measurement device independent quantum key distribution (CV-MDI-QKD) protocols have been shown to effectively increase the total transmission distances drastically. In this paper we show that photon subtraction on a two mode squeezed coherent (PSTMSC) state can further improve the transmission distances remarkably. To that end we also provide a generalized covariance matrix corresponding to PSTMSC, which has not been attempted before. We show that coherence, defined as the amount of displacement of vacuum state, along with non-Gaussianity can help improve the performance of prevalent CV-MDI-QKD protocols. Furthermore, since we use realistic parameters, our technique is experimentally feasible and can be readily implemented. * chandankumar@iisermohali.ac.in † jaskaransinghnirankari@iisermohali.ac.in ‡ soumyabose@iisermohali.ac.in § arvind@iisermohali.ac.in

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Section: Introductionmentioning

confidence: 99%

Coherence-assisted non-Gaussian measurement-device-independent quantum key distribution

et al. 2019

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“…[27][28][29], assuming measurementdevice-independence (MDI) [30,31] as a counter-measure against detectors' side-channel attacks, have extended the concept of CV-QKD to end-to-end network implementations [32]. For most of these protocols, not only experiments were shown [27,[33][34][35][36][37][38][39][40], but also their security analysis has been gradually refined to incorporate finite-size effects [41][42][43] and composable aspects [44][45][46].…”

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confidence: 99%

Quantum key distribution with phase-encoded coherent states: Asymptotic security analysis in thermal-loss channels

et al. 2018

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We consider discrete-alphabet encoding schemes for coherent-state quantum key distribution. The sender encodes the letters of a finite-size alphabet into coherent states whose amplitudes are symmetrically distributed on a circle centered in the origin of the phase space. We study the asymptotic performance of this phase-encoded coherent-state protocol in direct and reverse reconciliation assuming both loss and thermal noise in the communication channel. In particular, we show that using just four phase-shifted coherent states is sufficient for generating secret key rates of the order of 4 × 10 −3 bits per channel use at about 15 dB loss in the presence of realistic excess noise.

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“…No third-parties can obtain the secret information, even though the measurement results are published, thus all side-channel attacks targeted at the detectors are eliminated. This form of communication works well for striking a balance between the grade of security [34,35] and practicability, and it is particularly suitable for long-distance transmission [36] and for multiuser communication across a star topology network [37,38].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous two-way classical communication and measurement-device-independent quantum key distribution with coherent states

Pan

Ruan

et al. 2020

Phys. Rev. A

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Simultaneous quantum and classical communication integrates both continuous variable quantum key distribution and classical coherent optical communication by using the same communication infrastructure. Given its compelling benefits, we proposed a protocol relying on both two-way classical communication and on measurement-device-independent quantum key distribution, in which the superposition modulation based coherent states depend on the information bits of both the secret key and on the classical communication ciphertext, which are measured by an untrusted relay node. The proposed scheme strikes a beneficial balance between its level of security and its grade of practicability. Explicitly, on the one hand, the secret key obtained is secure against all attacks on the detectors, and it is eminently suitable for bidirectional classical communication in the metropolitan network as a benefit of its relay-based configuration. Our results show a convincing bit error rate vs. secret key rate trade-off for transmission over dozens of kilometers in the quantum channel, hence striking an excellent integrity (bit error rate) vs. security trade-off.

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Continuous-variable measurement-device-independent quantum key distribution: Composable security against coherent attacks

Cited by 98 publications

References 40 publications

Coherence-assisted non-Gaussian measurement-device-independent quantum key distribution

Coherence-assisted non-Gaussian measurement-device-independent quantum key distribution

Quantum key distribution with phase-encoded coherent states: Asymptotic security analysis in thermal-loss channels

Simultaneous two-way classical communication and measurement-device-independent quantum key distribution with coherent states

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