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Near-term quantum-repeater experiments with nitrogen-vacancy centers - Overcoming the limitations of direct transmission

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2019-05-22
JournalPhysical review. A/Physical review, A
AuthorsFilip Rozpędek, Raja Yehia, Kenneth Goodenough, Maximilian Ruf, Peter C. Humphreys
InstitutionsCentre National de la Recherche Scientifique, Sorbonne UniversitƩ
Citations129

Abstract

Section titled ā€œAbstractā€

Quantum channels enable the implementation of communication tasks\ninaccessible to their classical counterparts. The most famous example is the\ndistribution of secret key. However, in the absence of quantum repeaters, the\nrate at which these tasks can be performed is dictated by the losses in the\nquantum channel. In practice, channel losses have limited the reach of quantum\nprotocols to short distances. Quantum repeaters have the potential to\nsignificantly increase the rates and reach beyond the limits of direct\ntransmission. However, no experimental implementation has overcome the direct\ntransmission threshold. Here, we propose three quantum repeater schemes and\nassess their ability to generate secret key when implemented on a setup using\nnitrogen-vacancy (NV) centers in diamond with near-term experimental\nparameters. We find that one of these schemes - the so-called single-photon\nscheme, requiring no quantum storage - has the ability to surpass the capacity\n- the highest secret-key rate achievable with direct transmission - by a factor\nof 7 for a distance of approximately 9.2 km with near-term parameters,\nestablishing it as a prime candidate for the first experimental realization of\na quantum repeater.\n

Tech Support

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Original Source

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References

Section titled ā€œReferencesā€
  1. 2005 - International Conference on the Theory and Application of Cryptology and Information Security
  2. 2007 - International Conference on the Theory and Application of Cryptology and Information Security
  3. 1984 - International Conference on Computer System and Signal Processing, Bangalore, India

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