QKD system with common-mode dithering

Details QKD system with common-mode dithering QKD system with common-mode dithering

2007-07-20

2011-11-15

Curs, Nathan (Department: 2613)

Optical communications

Transmitter and receiver system

C398S141000, C380S256000, C380S277000, C380S278000, C380S283000

Reexamination Certificate

active

08059964

ABSTRACT:
A QKD system (10) having two QKD stations (Alice and Bob) optically coupled by an optical fiber link (FL), wherein Bob includes a variable timing delay arranged between Bob's controller (CB) and modulator (MB) or detector unit (40). A set-up and calibration procedure is performed wherein delay DL2is adjusted until the timings for the modulator and detector unit (TSBand TS42, respectively) are established. Delay DL2is then fixed so that the detector unit and modulator operate in a common timing mode that is not changed if the synchronization signal is changed. The timing TSSof the synchronization (sync) signals (SS) sent from Alice to Bob is adjusted to arrive at optimum system performance. Once the QKD system is in operation, because the sync signal can drift, the sync signal timing TSSis dithered maintain optimum QKD system performance. Since the modulator and detector unit timing is tied together, dithering the sync signal also dithers the modulator and detector unit together in a “common mode,” rather than varying the timing of each of these elements separately.

REFERENCES:
patent: 4469942 (1984-09-01), Srivastava
patent: 5515438 (1996-05-01), Bennett et al.
patent: 6236488 (2001-05-01), Shimizu et al.
patent: 6445478 (2002-09-01), Shimizu et al.
patent: 6462825 (2002-10-01), Wiebesick et al.
patent: 2005/0047601 (2005-03-01), Shields et al.
patent: 2006/0016972 (2006-01-01), Lagasse
patent: 2006/0018475 (2006-01-01), Vig et al.
patent: 2006/0088159 (2006-04-01), Mitchell et al.
patent: 2006/0239460 (2006-10-01), Young
patent: 2006/0239463 (2006-10-01), Young
patent: 2007/0064945 (2007-03-01), Yuan et al.
patent: 2007/0133799 (2007-06-01), Vig et al.
patent: 2007/0160212 (2007-07-01), Zavriyev et al.
patent: 2008/0292102 (2008-11-01), Wang et al.
patent: WO 9404889 (1994-03-01), None
Stucki et al, “Photon counting for quantum key distribution with Peltier cooled InGaAs/InP”, http://arxiv.org quant-ph/0106007v1, pp. 1-18, Jun. 1, 2001.

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