We have achieved efficient single-photon detection at 1.55 /spl mu/m by sum-frequency mixing with a strong cw pump at 1064 nm in periodically-poled lithium niobate and subsequent single-photon counting in the visible.
Franco N. C. WongMarius A. AlbotǎJeffrey H. Shapiro
Seth R. BankMark A. WisteyLynford L. GoddardH. B. YuenHopil BaeJ. S. Harris
J. MasumD. RamooN. BalkanMartin Adams
Marius A. AlbotǎFranco N. C. Wong