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Proceedings Paper

Path-length control in an interferometric QKD link
Author(s): Brig B. Elliott; Oleksiy Pikalo; John Schlafer; Greg Troxel
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Paper Abstract

We describe a phase-encoded quantum key distribution system the uses continuous control of receiver-interferometer path length to maintain alignment with the transmitter. In this fiber-based system, a small number of training frames are sent over the quantum channel that allow the receiver to compensate for drift in the transmitter and receiver interferometers due to slow changes in temperature. The system is self-starting after disruption and can maintain a quantum bit error rate of less than 7% for phase drift rates of 0.5 deg/sec. The control system design is described and measured system data is compared with simulations.

Paper Details

Date Published: 4 August 2003
PDF: 13 pages
Proc. SPIE 5105, Quantum Information and Computation, (4 August 2003); doi: 10.1117/12.487541
Show Author Affiliations
Brig B. Elliott, BBN Technologies (United States)
Oleksiy Pikalo, BBN Technologies (United States)
John Schlafer, BBN Technologies (United States)
Greg Troxel, BBN Technologies (United States)

Published in SPIE Proceedings Vol. 5105:
Quantum Information and Computation
Eric Donkor; Andrew R. Pirich; Howard E. Brandt, Editor(s)

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