Practical device-independent quantum cryptography via entropy accumulation

Arnon-Friedman, Rotem; Dupuis, Frédéric; Fawzi, Omar; Renner, Renato; Vidick, Thomas

doi:10.1038/s41467-017-02307-4

Cited by 206 publications

(366 citation statements)

References 42 publications

Supporting

Mentioning

361

Contrasting

Order By: Relevance

“…This fact could be easily implemented in our N-BB84 protocol, thanks to the properties of the uncertainty relation [14]. A more drastic approach is represented by deviceindependent QKD (DIQKD) [15,16], where no assumption is made on the devices except for spatial separation. In this context it is worth mentioning the recent security proof of a multipartite DIQKD protocol [6].…”

Section: Discussionmentioning

confidence: 99%

Finite-key effects in multipartite quantum key distribution protocols

2018

View full text Add to dashboard Cite

We analyze the security of two multipartite quantum key distribution (QKD) protocols, specifically we introduce an N-partite version of the BB84 protocol and we discuss the N-partite six-state protocol proposed by Epping et al (2017 New J. Phys. 19 093012). The security analysis proceeds from the generalization of known results in bipartite QKD to the multipartite scenario, and takes into account finite resources. In this context we derive a computable expression for the achievable key rate of both protocols by employing the best-known strategies: the uncertainty relation and the postselection technique. We compare the performances of the two protocols both for finite resources and infinitely many signals.Quantum key distribution (QKD) represents one of the primary applications of quantum information science. Since the proposal of the first QKD protocols [1, 2], major advancements have been achieved both on the theoretical and experimental side [3,4]. A QKD protocol provides a systematic procedure through which two honest parties (Alice and Bob) generate a secret shared key, when connected by an insecure quantum channel and an authenticated insecure classical channel.Recently the generalization of such protocols to multipartite schemes has been investigated [5,6]. It has been shown that there are quantum-network configurations [5] or noise regimes [6] in which the execution of a multipartite scheme is advantageous with respect to establishing a multipartite secret key via many independent bipartite protocols. However, the analysis of multipartite QKD protocols has only been carried out in the unrealistic scenario of infinitely many signals exchanged through the quantum channel.We compare the performances of two multipartite QKD protocols, which constitute the N-partite versions of the asymmetric BB84 [1] and the asymmetric six-state protocol [7], and will be denoted as N-BB84 and N-sixstate protocol. While the N-six-state protocol was first proposed in [5], the N-BB84 constitutes a novel multipartite QKD protocol.Our analysis is conducted in the practical case of a finite amount of resources (signals) at the N parties' disposal. The action of a potential eavesdropper (Eve) on the insecure quantum channel is not restricted at all, as she is allowed to perform any kind of attack (coherent attacks) on the exchanged signals. What is assumed is that the parties have access to true randomness and that the devices performing measurements on the quantum systems work according to their ideal functionality.The article is structured as follows. In section 1 we extend notions and results of bipartite QKD security analysis to the multipartite scenario. In section 2 we review the N-six-state protocol and introduce the N-BB84 protocol. Then we obtain a computable expression for their secret key lengths in the case of finite resources. In section 3 we compare the achievable key rates of the two NQKD protocols in the presence of finite and infinite resources. We conclude the article in section 4. Multipartite QKD: general framewo...

show abstract

Section: Discussionmentioning

confidence: 99%

Finite-key effects in multipartite quantum key distribution protocols

2018

View full text Add to dashboard Cite

show abstract

“…+ Now, let us consider a class of device-independent protocols in which the eavesdropper is restricted by quantum mechanics. These models have previously been studied in [ABG+07,AFDF+18]. The general form of a device-independent protocol with a quantum eavesdropper remains the same except that we now consider a quantum extension (27) of the state in (217).…”

Section: Faithfulness Of Intrinsic Non-localitymentioning

confidence: 99%

Fundamental limits on key rates in device-independent quantum key distribution

2020

View full text Add to dashboard Cite

In this paper, we introduce intrinsic non-locality and quantum intrinsic non-locality as quantifiers for Bell non-locality, and we prove that they satisfy certain desirable properties such as faithfulness, convexity, and monotonicity under local operations and shared randomness. We then prove that intrinsic non-locality is an upper bound on the secret-key-agreement capacity of any deviceindependent protocol conducted using a device characterized by a correlation p, while quantum intrinsic non-locality is an upper bound on the same capacity for a correlation arising from an underlying quantum model. We also prove that intrinsic steerability is faithful, and it is an upper bound on the secret-key-agreement capacity of any one-sided-device-independent protocol conducted using a device characterized by an assemblager. Finally, we prove that quantum intrinsic non-locality is bounded from above by intrinsic steerability.

show abstract

“…It is plausible that the proposed scheme inherits the security of the underlying, in our case, the original semidevice-independent quantum key distribution protocol. Given the full proof of security of the SDI QKD against a forward signaling adversary, as it is the case for the DI QKD [65] (see [66] for the latest breakthrough), it may follow that our suitably modified scheme is fully unforgeable. Sufficient modification concerns the communication in the verification procedure.…”

Section: Discussionmentioning

confidence: 99%

Semi-device-independent quantum money

Horodecki

Stankiewicz

2020

New J. Phys.

View full text Add to dashboard Cite

The seminal idea of quantum money, not forgeable due to laws of Quantum Mechanics, proposed by Stephen Wiesner, has laid the foundations for the Quantum Information Theory in the early '70s.Recently, several other schemes for quantum currencies have been proposed, all, however, relying on the assumption that the quantum source device, acts according to its specification. This makes several known quantum money protocols vulnerable to the so-called hardware Trojan horse attacks. We, therefore, study the following problem: to what extent quantum money schemes can be made independent from the inner working of source and verification-devices used by the honest parties (bank and mint) in creating and processing the quantum money? Drawing inspirations from the semi-device-independent quantum key distribution protocol, we introduce the first scheme of quantum money with this assumption partially relaxed, along with the proof of its unforgeability. Finally, we formulate and discuss a quantum analog of the Oresme-Copernicus-Gresham's law of economy, that may hold in the future.

show abstract

Practical device-independent quantum cryptography via entropy accumulation

Cited by 206 publications

References 42 publications

Finite-key effects in multipartite quantum key distribution protocols

Finite-key effects in multipartite quantum key distribution protocols

Fundamental limits on key rates in device-independent quantum key distribution

Semi-device-independent quantum money

Contact Info

Product

Resources

About