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Opt Express. 2008 Sep 29;16(20):15469-76.

Differential-phase-shift quantum secret sharing.

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  • 1Osaka University, 2-1 Yamada-oka, Suita-shi, Osaka, 565-0871, Japan.


A quantum secret sharing (QSS) protocol based on a differential-phase-shift scheme is proposed, which quantum mechanically provides a full secret key to one party and partial keys to two other parties. A weak coherent pulse train is utilized instead of individual photons as in conventional schemes. Compared with previous QSS protocols, the present one features a simple setup, is suitable for fiber transmission, and offers the possibility for a high key creation rate. An experiment is also carried out to demonstrate the operation.

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