Advances in Quantum Cryptography

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JournalAdvances in Optics and Photonics
DateAccepted/In press - 27 Feb 2020
DateE-pub ahead of print - 14 Dec 2020
DatePublished (current) - 31 Dec 2020
Issue number4
Volume12
Number of pages224
Pages (from-to)1012-1236
Early online date14/12/20
Original languageEnglish

Abstract

Quantum cryptography is arguably the fastest growing area in quantum information science. Novel theoretical protocols are designed on a regular basis, security proofs are constantly improving, and experiments are gradually moving from proof-of-principle lab demonstrations to in-field implementations and technological prototypes. In this review, we provide both a general introduction
and a state of the art description of the recent advances in the field, both theoretically and experimentally. We start by reviewing protocols of quantum key distribution based on discrete variable systems. Next we consider aspects of device independence, satellite challenges, and protocols based on continuous variable systems. We will then discuss the ultimate limits of point-to-point
private communications and how quantum repeaters and networks may overcome these restrictions. Finally, we will discuss some aspects of quantum cryptography beyond standard quantum key distribution, including quantum random number generators and quantum digital signatures.

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