Abstract

A one-way quantum key distribution scheme based on intrinsically stable Faraday-mirror-type Michelson interferometers with four-port polarizing beam splitters has been demonstrated that can compensate for birefringence effects automatically. The encoding is performed with phase modulators, but decoding is accomplished through measurement of the polarization state of Bob’s photons. An extinction ratio of about $30\mathrm{dB}$ was maintained for several hours over $50\mathrm{km}$ of fiber at $1310\mathrm{nm}$ without any adjustment to the setup, which shows its good potential for practical systems.

© 2007 Optical Society of America

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