Abstract

Two methods for quantum cryptography are being compared in an ongoing experiment intended to determine their relative advantages and disadvantages. The first method is a modification of the original polarization approach first demonstrated by Bennett, Bessette, and Brassard.¹ The system being tested uses polarization-pre- sewing optical fiber, a pulsed-laser-diode light source, and a fourth Pockels cell in a feedback loop to compensate for drift in the fiber. The advantages of this system include an inexpensive light source and high potential data rates.

© 1993 Optical Society of America