Quantum discord as a resource for quantum cryptography

Pirandola, Stefano

doi:10.1038/srep06956

Cited by 156 publications

(132 citation statements)

References 43 publications

Supporting

Mentioning

128

Contrasting

Unclassified

Order By: Relevance

“…Achieving this in a cheap and reliable way is essential to the development of future quantum technologies. They also reinforces the role of quantum discord as a beneficial and practically relevant quantity [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]: as discord appears to bound the entanglement gain and to allow for excessive entanglement distribution, it emerges as a key player of fundamental relevance in the context of quantum communication and networking.…”

Section: Discussionsupporting

confidence: 52%

Excessive distribution of quantum entanglement

et al. 2016

View full text Add to dashboard Cite

We classify protocols of entanglement distribution as excessive and non-excessive ones. In a non-excessive protocol, the gain of entanglement is bounded by the amount of entanglement being communicated between the remote parties, while excessive protocols violate such bound. We first present examples of excessive protocols that achieve a significant entanglement gain. Next we consider their use in noisy scenarios, showing that they improve entanglement achieved in other ways and for some situations excessive distribution is the only possibility of gaining entanglement.

show abstract

Section: Discussionsupporting

confidence: 52%

Excessive distribution of quantum entanglement

et al. 2016

View full text Add to dashboard Cite

show abstract

“…The further exploration of the role and power of QCs in quantum key distribution protocols certainly has potential [253,251,252], but its scope exceeds the present review, and we point the interested reader to [250,254] for an overview on quantum cryptography.…”

Section: Remote State Preparationmentioning

confidence: 92%

“…From the outset, this problem seems tailored to utilising the resource of QCs and in particular the inherent non-orthogonality of bipartite states with nonzero QCs. Consequently, it was shown in [251] that quantumly correlated states are necessary for quantum key distribution in the device-dependent setting -which corresponds to the distributing and receiving parties being able to trust their devices.…”

Section: Remote State Preparationmentioning

confidence: 99%

Measures and applications of quantum correlations

Adesso¹,

Bromley²,

Cianciaruso³

2016

J. Phys. A: Math. Theor.

370

416

View full text Add to dashboard Cite

Abstract. Quantum information theory is built upon the realisation that quantum resources like coherence and entanglement can be exploited for novel or enhanced ways of transmitting and manipulating information, such as quantum cryptography, teleportation, and quantum computing. We now know that there is potentially much more than entanglement behind the power of quantum information processing. There exist more general forms of non-classical correlations, stemming from fundamental principles such as the necessary disturbance induced by a local measurement, or the persistence of quantum coherence in all possible local bases. These signatures can be identified and are resilient in almost all quantum states, and have been linked to the enhanced performance of certain quantum protocols over classical ones in noisy conditions. Their presence represents, among other things, one of the most essential manifestations of quantumness in cooperative systems, from the subatomic to the macroscopic domain. In this work we give an overview of the current quest for a proper understanding and characterisation of the frontier between classical and quantum correlations in composite states. We focus on various approaches to define and quantify general quantum correlations, based on different yet interlinked physical perspectives, and comment on the operational significance of the ensuing measures for quantum technology tasks such as information encoding, distribution, discrimination and metrology. We then provide a broader outlook of a few applications in which quantumness beyond entanglement looks fit to play a key role.

show abstract

“…In this scenario, an important role is also played by quantum entanglement [3], which can be exploited to make QKD protocols device-independent, i.e., more robust to practical flaws (e.g., in the detectors) which may potentially be exploited by Eve. Very recently, quantum discord [4] (see [5] for its computation with Gaussian states) has also been identified as a useful resource for device-dependent QKD with trusted noise [6], e.g., in scenarios such as measurement-device independent QKD [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Cryptographic Aspects of Quantum Reading

Spedalieri

2015

Entropy

View full text Add to dashboard Cite

Besides achieving secure communication between two spatially-separated parties, another important issue in modern cryptography is related to secure communication in time, i.e., the possibility to confidentially store information on a memory for later retrieval. Here we explore this possibility in the setting of quantum reading, which exploits quantum entanglement to efficiently read data from a memory whereas classical strategies (e.g., based on coherent states or their mixtures) cannot retrieve any information. From this point of view, the technique of quantum reading can provide a new form of technological security for data storage.

show abstract

Quantum discord as a resource for quantum cryptography

Cited by 156 publications

References 43 publications

Excessive distribution of quantum entanglement

Excessive distribution of quantum entanglement

Measures and applications of quantum correlations

Cryptographic Aspects of Quantum Reading

Contact Info

Product

Resources

About