This article is cited in 11 papers

Quantum cryptography

Role of intensity fluctuations in quantum cryptography with coherent states

D. A. Kronberg^a, Yu. V. Kurochkin<sup>b

a</sup> Steklov Mathematical Institute of Russian Academy of Sciences, Moscow
^b International Center for Quantum Optics and Quantum Technologies (the Russian Quantum Center), Moscow, Skolkovo

Abstract: A new type of attack in quantum cryptography with coherent states is considered. This attack calls for only a possibility of changing (within some limits) the intensity of the states reaching a receiver. The critical quantum bit error rate (QBER) of the B92 protocol with a strong reference state is calculated for different limitations on intensity.

Keywords: quantum cryptography, quantum information, coherent states.

Received: 24.05.2018
Revised: 03.07.2018

 English version: Quantum Electronics, 2018, 48:9, 843–848

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