Preamplified photodetectors for high-fidelity postselecting optical devices

Abstract

The fidelity of postselecting devices based on direct photon number detection can be significantly improved by insertion of a phase-insensitive optical amplifier in front of the detector. The scheme is simple, and the cost to the probability of obtaining the appropriate detector outcome is low.Comment: 5 pages, 7 figures, typos corrected and Journal Ref Adde