Quantum Digital Signatures without Quantum Memory

Dunjko, Vedran; Wallden, Petros; Andersson, Erika

doi:10.1103/physrevlett.112.040502

Cited by 141 publications

(143 citation statements)

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“…Furthermore, we note that the protocol of Ref. [30] has already been experimentally demonstrated [32], showing that these protocols can indeed be readily implemented.…”

Section: Qds Protocolmentioning

confidence: 68%

“…[29] as a method of guaranteeing the authenticity and integrity of a classic message with unconditional security based only on fundamental principles of quantum mechanics. Recently, other protocols for QDS have been proposed that, notably, use sequences of coherent states and linear optics transformations [30][31][32][33]. In this section, we apply the mapping to construct a new QDS protocol that can be realized using sequences of coherent states and simple linear optics transformations.…”

Section: Quantum Digital Signaturesmentioning

confidence: 99%

“…[29] with those of Refs. [30][31][32] and also to better understand the properties of these latter protocols.…”

Section: Quantum Digital Signaturesmentioning

confidence: 99%

“…Nevertheless, we expect that a full security proof can be constructed from the results of Refs. [29] and [30].…”

Section: Qds Protocolmentioning

confidence: 99%

“…[30], the public-key states are also of the form of Eq. (30). This implies that they can be equally thought of as arising from an application of the coherent-state mapping to the qubit states of Eq.…”

Section: Qds Protocolmentioning

confidence: 99%

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Quantum communication with coherent states and linear optics

Arrazola

Lütkenhaus

2014

Phys. Rev. A

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We introduce a general mapping for encoding quantum communication protocols involving pure states of multiple qubits, unitary transformations, and projective measurements into another set of protocols that employ coherent states of light in a superposition of optical modes, linear optics transformations and measurements with single-photon threshold detectors. This provides a general framework for transforming protocols in quantum communication into a form in which they can be implemented with current technology. We explore the similarity between properties of the original qubit protocols and the coherent-state protocols obtained from the mapping and make use of the mapping to construct new protocols in the context of quantum communication complexity and quantum digital signatures. Our results have the potential of bringing a wide class of quantum communication protocols closer to their experimental demonstration.What information-processing tasks are unachievable in a classical world but become possible when exploiting the intrinsic quantum mechanical properties of physical systems? This question has been a driving force of numerous research endeavours over the last few decades and remarkable progress has been made in our understanding of the advantages that quantum mechanics can provide, as well is in developing the experimental platforms that will allow them to be realized in practice [1][2][3][4]. An example is the field of quantum communication [5], where quantum systems can be used, for instance, to distribute secret keys [6,7] or reduce the amount of communication required for joint computations [8][9][10][11].In terms of experimental implementations, only quantum key distribution (QKD) has been routinely demonstrated and deployed over increasingly complex networks and large distances [12,13]. This is possible largely due to the fact that, fundamentally, QKD can be carried out with sequences of independent signals and measurements [4]. Other tasks typically require sophisticated quantum states to be prepared and transmitted as well as performing complex operations on them. Overall, there is a large set of quantum communication protocols whose potential advantages currently escape the grasp of available technology, with only a few proof-of-principle implementations having been reported [14][15][16].Confronted with these challenges we face two alternatives: We can either strive to improve current technology or we can flip the issue around and ask: Can protocols in quantum communication be adapted to a form that makes them ready to be deployed with available techniques? To adopt the latter strategy is to push for a theoretical reformulation that converts previously intractable protocols into a form that, while conserving their relevant features, eliminates the obstacles affecting their implementation. This is precisely the road that has already been successfully followed for QKD.In this work, we describe an abstract mapping that converts quantum communication protocols that use pure states of multiple qubits, ...

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“…Furthermore, we note that the protocol of Ref. [30] has already been experimentally demonstrated [32], showing that these protocols can indeed be readily implemented.…”

Section: Qds Protocolmentioning

confidence: 68%

Section: Quantum Digital Signaturesmentioning

confidence: 99%

“…[29] with those of Refs. [30][31][32] and also to better understand the properties of these latter protocols.…”

Section: Quantum Digital Signaturesmentioning

confidence: 99%

“…Nevertheless, we expect that a full security proof can be constructed from the results of Refs. [29] and [30].…”

Section: Qds Protocolmentioning

confidence: 99%

Section: Qds Protocolmentioning

confidence: 99%