  Transition edge sensors (TES) have the highest reported efficiencies (>98%)
for detection of single photons in the visible and near infrared. Experiments
in quantum information and foundations of physics that rely critically on this
efficiency have started incorporating these detectors into con- ventional
quantum optics setups. However, their range of applicability has been hindered
by slow operation both in recovery time and timing jitter. We show here how a
conventional tungsten-TES can be operated with jitter times of < 4 ns, well
within the timing resolution necessary for MHz clocking of experiments, and
providing an important practical simplification for experiments that rely on
the simultaneous closing of both efficiency and locality loopholes.

Quantum Physics;Instrumentation and Detectors