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Proceedings Paper

Information reconciliation (IR) for continuous variable quantum key distribution (QKD) over free space optics (FSO) channel
Author(s): Fred Daneshgaran; Marina Mondin; Shlomi Arnon; Francesco Di Stasio; Judy Kupferman
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Paper Abstract

Quantum Key Distribution (QKD) is a communication method which exchanges secret keys using cryptographic protocols involving elements from quantum science. Continuous Variable (CV) QKD is a method to implement key exchange using sampling of Gaussian signals. Reconciliation in CV-QKD is fundamentally realized via coding of the Alice or Bob binary labels of the Gaussian samples using either one-way or interactive communications between the parties, Alice and Bob, over a public authenticated channel. We assume that the communication is performed through an Optical Wireless (OW) or Free Space Optics (FSO) channel. In that case the received signal suffers from stochastic fading due to pointing jitter or atmospheric turbulence. As a result of the channel fading and noise Alice and Bob Gaussian samples will not match. Information Reconciliation (IR) is the phase of the CV-QKD protocol that makes sure that Alice and Bob agree on a common and identical labeling of their samples, i.e. agree on a common stream of bits that we denote as “reconciled key.” The information reconciliation in CV-QKD could be done by one-way or two-way channel coding to correct the actual labels so that they do match. To do so Bob generates a sequence of parity bits using a systematic code. These bits are sent to Alice over an authenticated public channel. Alice then uses her own sequence of labels she obtains after quantization with the redundancy provided by Bob to recover Bob’s binary sequence. In this work we analyze the problem of information reconciliation for continuous variable quantum key distribution over a free space optics channel.

Paper Details

Date Published: 4 March 2019
PDF: 7 pages
Proc. SPIE 10910, Free-Space Laser Communications XXXI, 1091017 (4 March 2019); doi: 10.1117/12.2510606
Show Author Affiliations
Fred Daneshgaran, California State Univ., Los Angeles (United States)
Marina Mondin, California State Univ., Los Angeles (United States)
Politecnico Di Torino (Italy)
Shlomi Arnon, Ben-Gurion Univ. of the Negev (Israel)
Francesco Di Stasio, Politecnico di Torino (Italy)
Judy Kupferman, Ben-Gurion Univ. of the Negev (Israel)

Published in SPIE Proceedings Vol. 10910:
Free-Space Laser Communications XXXI
Hamid Hemmati; Don M. Boroson, Editor(s)

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