Memory-assisted quantum key distribution with a single nitrogen-vacancy center
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2017-11-13 |
| Journal | Physical review. A/Physical review, A |
| Authors | NicolĆ² Lo Piparo, Mohsen Razavi, William J. Munro |
| Institutions | NTT Basic Research Laboratories, National Institute of Informatics |
| Citations | 33 |
Abstract
Section titled āAbstractāMemory-assisted measurement-device-independent quantum key distribution\n(MA-MDI-QKD) is a promising scheme that aims to improve the\nrate-versus-distance behavior of a QKD system by using the state-of-the-art\ndevices. It can be seen as a bridge between current QKD links to quantum\nrepeater based networks. While, similar to quantum repeaters, MA-MDI-QKD relies\non quantum memory (QM) units, the requirements for such QMs are less demanding\nthan that of probabilistic quantum repeaters. Here, we present a variant of\nMA-MDI-QKD structure that relies on only a single physical QM: a\nnitrogen-vacancy center embedded into a cavity where its electronic spin\ninteracts with photons and its nuclear spin is used for storage. This enables\nus to propose a simple but efficient MA-MDI-QKD scheme resilient to memory\nerrors and capable of beating, in terms of rate and reach, existing QKD\ndemonstrations. We also show how we can extend this setup to a quantum repeater\nsystem, reaching, thus, larger distances.\n