  Single photon detection and timing gathered increasing interest in the last
few years due to both its necessity in the field of quantum sensing and the
advantages of single quanta detection in the field of low level light imaging.
While simple bucket detectors are mature enough for commercial applications,
more complex imaging detectors are still a field of research with mostly
prototype level detectors. A major problem in these detectors is the
implementation of in-pixel timing circuitry, especially for two-dimensional
imagers. One of the most promising approaches is the use of voltage controlled
ring resonators in every pixel. Each of those is running independently, based
on a voltage supplied by a global reference. However, this yields the problem
that across the chip the supply voltage can change, which in turn changes the
period of the ring resonator. Due to additional parasitic effects, this problem
can worsen with increasing measurement time, leading to a drift of the timing
information. We present here a method to identify and correct such temporal
drifts of single photon detectors, based on asynchronous quantum ghost imaging.
We also show the effect of this correction on a recent QGI measurement from our
group.
