Experimental demonstration of Gaussian protocols for one-sided device-independent quantum key distribution

Walk, Nathan; Hosseini, Sara; Geng, Jiao; Thearle, Oliver; Haw, Jing Yan; Armstrong, Seiji; Assad, Syed M.; Janoušek, Jiří; Ralph, T. C.; Symul, Thomas; Wiseman, Howard Mark; Lam, Ping Koy

doi:10.1364/optica.3.000634

Cited by 180 publications

(115 citation statements)

References 73 publications

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“…As shown in [4], EPR steering is necessary, but not sufficient for 1SDI-QKD. The continuous-variable case was analyzed by Walk et al [34]. In their work, the secret key is encoded in theX quadrature of a field mode j , and a sufficiently strong demonstration of continuous-variable EPR steering from mode i to j bounds the information that an eavesdropper can have about the key, in a way that is independent of the device at mode i, so that a secret key rate obtained using reverse reconciliation is lower bounded by…”

Section: An Asymmetric Systemmentioning

confidence: 99%

Versatility of continuous-variable asymmetric tripartite entanglement allows Alice and Clare to keep secrets from Bob

Olsen¹,

Cavalcanti²

2016

Phys. Rev. A

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The fully symmetric Gaussian tripartite entangled pure states will not exhibit two-mode Einstein-PodolskyRosen (EPR) steering. This means that any two participants cannot share quantum secrets using the security of one-sided device independent quantum key distribution (1SDI-QKD) without involving the third. They are restricted at most to standard quantum key distribution, which is less secure. Here we demonstrate an asymmetric tripartite system that can exhibit bipartite EPR steering, so that two of the participants can use 1SDI-QKD without involving the other. This is possible because the promiscuity relations of continuous-variable tripartite entanglement are different from those of discrete-variable systems. We analyze these properties for two different systems, showing that the asymmetric system exhibits practical properties not found in the symmetric one.

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Section: An Asymmetric Systemmentioning

confidence: 99%

Versatility of continuous-variable asymmetric tripartite entanglement allows Alice and Clare to keep secrets from Bob

Olsen¹,

Cavalcanti²

2016

Phys. Rev. A

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“…In this framework, the client trusts all of his quantum resources but distrusts the server. EPR-steering has also been utilised for one-sided device-independent quantum key distribution where the 'one-sided' indicates that one of the parties does not trust their device but the other does [18,19]. There have even been experimental demonstrations of cryptographic schemes in this direction [20].…”

Section: Introductionmentioning

confidence: 99%

Self-testing through EPR-steering

Šupić

Hoban

2016

New J. Phys.

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The verification of quantum devices is an important aspect of quantum information, especially with the emergence of more advanced experimental implementations of quantum computation and secure communication. Within this, the theory of device-independent robust self-testing via Bell tests has reached a level of maturity now that many quantum states and measurements can be verified without direct access to the quantum systems: interaction with the devices is solely classical. However, the requirements for this robust level of verification are daunting and require high levels of experimental accuracy. In this paper we discuss the possibility of self-testing where we only have direct access to one part of the quantum device. This motivates the study of self-testing via EPR-steering, an intermediate form of entanglement verification between full state tomography and Bell tests. Quantum non-locality implies EPR-steering so results in the former can apply in the latter, but we ask what advantages may be gleaned from the latter over the former given that one can do partial state tomography? We show that in the case of self-testing a maximally entangled two-qubit state, or ebit, EPR-steering allows for simpler analysis and better error tolerance than in the case of full device-independence. On the other hand, this improvement is only a constant improvement and (up to constants) is the best one can hope for. Finally, we indicate that the main advantage in self-testing based on EPR-steering could be in the case of self-testing multi-partite quantum states and measurements. For example, it may be easier to establish a tensor product structure for a particular party's Hilbert space even if we do not have access to their part of the global quantum system.

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“…For example, as a subchannel discrimination in quantum information [17] or as a resource for secure and one sided quantum key distribution [45,46,47,48]. Recently [1] it has been shown that two way steering is an important resource for secure quantum teleportation of continuous variable systems and in [49] steering inequalities were used for signatures of quantum teleportation for qubits.…”

Section: Introductionmentioning

confidence: 99%

Applications of EPR steering in quantum teleportation and NOON states

Zárate

2018

AIP Conference Proceedings

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Abstract. Einstein-Podolsky-Rosen (EPR) steering refers to the type of correlations described in the EPR paradox, where one observer seems to affect ("steer") the state of other observer by using local measurements. There have been several works regarding characterization and quantification of EPR steering. One characteristic of this non-local correlation is that it can be asymmetric, while entanglement is symmetric. This asymmetric property is relevant for potential applications of EPR steering to quantum information, in particular to quantum cryptography and quantum teleportation. This latter refers to the process where one observer sends an unknown quantum state to Bob, who is in a different location. They communicate by classical means. Here we will show that EPR steering is a necessary resource to obtain secure continuous variable teleportation. We will also consider NOON states, which is an example of an entangled state. For this state, we will present a steering signature. This contribution reviews the work derived in Refs.[1] and [2], which was presented as an invited talk in ELAF 2017.

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Experimental demonstration of Gaussian protocols for one-sided device-independent quantum key distribution

Cited by 180 publications

References 73 publications

Versatility of continuous-variable asymmetric tripartite entanglement allows Alice and Clare to keep secrets from Bob

Versatility of continuous-variable asymmetric tripartite entanglement allows Alice and Clare to keep secrets from Bob

Self-testing through EPR-steering

Applications of EPR steering in quantum teleportation and NOON states

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