330 research outputs found
Characterization of A Novel Avalanche Photodiode for Single Photon Detection in VIS-NIR Range
In this work we investigate operation in the Geiger mode of the new single
photon avalanche photo diode (SPAD) SAP500 manufactured by Laser Components.
This SPAD is sensitive in the range 400-1000nm and has a conventional
reach-through structure which ensures good quantum efficiency at the long end
of the spectrum. By use of passive and active quenching schemes we investigate
detection efficiency, timing jitter, dark counts, afterpulsing, gain and other
important parameters and compare them to the "standard" low noise SPAD C30902SH
from Perkin Elmer. We conclude that SAP500 offers better combination of
detection efficiency, low noise and timing precision
Quantum Random Number Generator using Photon-Number Path Entanglement
We report a novel quantum random number generator based on the
photon-numberpath entangled state which is prepared via two-photon quantum
interference at a beam splitter. The randomness in our scheme is of truly
quantum mechanical origin as it comes from the projection measurement of the
entangled two-photon state. The generated bit sequences satisfy the standard
randomness test
A novel active quenching circuit for single photon detection with Geiger mode avalanche photodiodes
In this paper we present a novel construction of an active quenching circuit
intended for single photon detection. For purpose of evaluation, we have
combined this circuit with a standard avalanche photodiode C30902S to form a
single photon detector. A series of measurements, presented here, show that
this single photon detector has a dead time of less than 40ns, maximum random
counting frequency of over 14MHz, low after pulsing, detection efficiency of
over 20% and a good noise performance. This simple and robust active quenching
circuit can be built from of-the-shelf electronic components and needs no
complicated adjustments.Comment: 9 pages, 13 figures, 15 reference
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