Quantum-noise randomized data encryption for wavelength-division-multiplexed fiber-optic networks

We demonstrate high-rate randomized data-encryption through optical fibers using the inherent quantum-measurement noise of coherent states of light. Specifically, we demonstrate 650 Mbit/s data encryption through a 10 Gbit/s data-bearing, in-line amplified 200-km-long line. In our protocol, legitima...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2005-06, Vol.71 (6), Article 062326
Main Authors: Corndorf, Eric, Liang, Chuang, Kanter, Gregory S., Kumar, Prem, Yuen, Horace P.
Format: Article
Language:English
Subjects:
ANNIHILATION OPERATORS
ATOMIC AND MOLECULAR PHYSICS
EIGENSTATES
ENERGY LEVELS
OPTICAL FIBERS
POLARIZATION
QUANTUM CRYPTOGRAPHY
SECRECY PROTECTION
SIGNALS
WAVELENGTHS
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Summary:We demonstrate high-rate randomized data-encryption through optical fibers using the inherent quantum-measurement noise of coherent states of light. Specifically, we demonstrate 650 Mbit/s data encryption through a 10 Gbit/s data-bearing, in-line amplified 200-km-long line. In our protocol, legitimate users (who share a short secret key) communicate using an M-ry signal set while an attacker (who does not share the secret key) is forced to contend with the fundamental and irreducible quantum-measurement noise of coherent states. Implementations of our protocol using both polarization-encoded signal sets as well as polarization-insensitive phase-keyed signal sets are experimentally and theoretically evaluated. Different from the performance criteria for the cryptographic objective of key generation (quantum key-generation), one possible set of performance criteria for the cryptographic objective of data encryption is established and carefully considered.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.71.062326