Quantum Information Processing, Vol. 5, No. 6, December 2006 (© 2006)
Fiber Optics Protocols for Quantum Communication
Received November 29, 2005; accepted December 14, 2005; Published online September 1, 2006
We show how the techniques developed for long distance quantum key distribu-
tion in optical ﬁbers can be used to demonstrate other quantum information pro-
cessing and communication protocols. We present a ﬁber optics realization of the
Deutsch–Jozsa and Bernstein–Vazirani algorithms. We describe a method, called
“error ﬁltration”, for reducing errors in quantum communication channels, and
present an experimental implementation thereof. We discuss the cryptographic
primitive of string ﬂipping, and present an experimental implementation which has
higher security than achievable using any classical protocol.
KEY WORDS: Quantum information; quantum communication; optical ﬁbers;
Deutsch-Jozsa algorithm; Bernstein-Vazirani algorithm; error ﬁltration; quan-
tum coin tossing.
PACS: 03.67.Dd; 03.67.Hk; 03.67.Lx; 03.67.Pp; 42.81.-i.
The ﬁeld of quantum information is based upon the idea that one should
use the speciﬁc features of quantum mechanics to carry out informa-
tion processing tasks that are impossible classical. Some of the landmarks
in this ﬁeld were the realization in 1984 by Bennett and Brassard that
quantum mechanics could be used for secure cryptography
called Quantum Key Distribution (QKD)—and the ﬁrst quantum algo-
rithm proposed in 1985 by Deutsch.
In 1990s saw many signiﬁcant dis-
coveries—described for instance in Ref. 3-, such as quantum teleportation,
quantum error correction and entanglement puriﬁcation, a quantum algo-
rithm that solves a problem of practical interest (Shor’s factoring algo-
rithm), the ﬁrst realistic proposals for building a quantum computer, etc...
Since then the ﬁeld has progressed signiﬁcantly, both from the theoretical
and practical aspects.
Laboratoire d’Information Quantique CP 165/59, Universit
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