# Bipartite coherent-state quantum key distribution with strong reference pulse

Bipartite coherent-state quantum key distribution with strong reference pulse We propose an optical scheme for quantum key distribution in which bits are encoded in relative phases of four bipartite weak coherent states $${|\alpha, \alpha\rangle, |-\alpha, -\alpha\rangle, |-\alpha, \alpha\rangle}$$ and $${|\alpha, -\alpha \rangle}$$ , with respect to a strong reference pulse. We discuss security of the scheme against eavesdropping strategies like, photon number splitting, photon beam splitting and intercept-resend attacks. It is found that present scheme is more sensitive against these eavesdropping strategies than the two-dimensional non-orthogonal state based protocol and BB84 protocol. Our scheme is very simple, requires only passive optical elements like beam splitters, phase shifters and photon detectors, hence is at the reach of presently available technology. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

# Bipartite coherent-state quantum key distribution with strong reference pulse

, Volume 12 (2) – Jun 28, 2012
14 pages

/lp/springer_journal/bipartite-coherent-state-quantum-key-distribution-with-strong-9S0ki2CawB
Publisher
Springer US
Subject
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-012-0438-z
Publisher site
See Article on Publisher Site

### Abstract

We propose an optical scheme for quantum key distribution in which bits are encoded in relative phases of four bipartite weak coherent states $${|\alpha, \alpha\rangle, |-\alpha, -\alpha\rangle, |-\alpha, \alpha\rangle}$$ and $${|\alpha, -\alpha \rangle}$$ , with respect to a strong reference pulse. We discuss security of the scheme against eavesdropping strategies like, photon number splitting, photon beam splitting and intercept-resend attacks. It is found that present scheme is more sensitive against these eavesdropping strategies than the two-dimensional non-orthogonal state based protocol and BB84 protocol. Our scheme is very simple, requires only passive optical elements like beam splitters, phase shifters and photon detectors, hence is at the reach of presently available technology.

### Journal

Quantum Information ProcessingSpringer Journals

Published: Jun 28, 2012

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