Abstract
The photon-counting performance of commercially available InGaAs/InP avalanche photodiodes operated in Geiger mode was investigated at temperatures between 77 and 260 K. In particular, their noise equivalent power was measured to be 4/spl times/10/sup -17/ WHz/sup -1/2/ at 77 K. The implications of these results in the context of a quantum cryptography application are discussed.
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