Limits to single photon detection: Transmission and amplification

Presenting Author: Tzula Propp, University of Oregon
Contributing Author(s): Steven J. van Enk

We construct a model of photo detection that is both idealized and realistic enough to calculate the limits and tradeoffs inherent to single photon detector (SPD) figures of merit. A linear quantum network comprised of discrete states and continua provides a general description of a passive SPD in the single-photon limit. We analyze criteria for perfect transmission through a such a network and analyze potential tradeoffs between transmission efficiency, spectral bandwidth, and group delay. Once a photon has been transmitted through the network, we consider the effects of signal amplification; by writing correct commutator-preserving transformations for non-linear photon-number amplification (e.g. avalanche photodiode, electron-hole pair creation), we can derive noise limits that show a marked improvement over the well-known Caves limit for linear amplification of bosonic modes. Lastly, we briefly discuss the construction of POVMs completely describing SPDs, from which we can calculate standard SPD figures of merit.

Read this article online: https://arxiv.org/abs/1809.02195

(Session 5 : Sunday from 5:00pm - 7:00pm)


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