5 research outputs found
Photon number resolving detection using time-multiplexing
Detectors that can resolve photon number are needed in many quantum
information technologies. In order to be useful in quantum information
processing, such detectors should be simple, easy to use, and be scalable to
resolve any number of photons, as the application may require great portability
such as in quantum cryptography. Here we describe the construction of a
time-multiplexed detector, which uses a pair of standard avalanche photodiodes
operated in Geiger mode. The detection technique is analysed theoretically and
tested experimentally using a pulsed source of weak coherent light.Comment: 20 pages, 14 figures, accepted to Journal of Modern Optic
Fiber-assisted detection with photon number resolution
We report the development of a photon-number resolving detector based on a
fiber-optical setup and a pair of standard avalanche photodiodes. The detector
is capable of resolving individual photon numbers, and operates on the
well-known principle by which a single mode input state is split into a large
number (eight) of output modes. We reconstruct the photon statistics of weak
coherent input light from experimental data, and show that there is a high
probability of inferring the input photon number from a measurement of the
number of detection events on a single run.Comment: 4 pages, 2 figures; Submitted for publicatio