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 s
tarted 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.
Bells theorem guarantees that no model based on local variables can reproduce quantum correlations. Also some models based on non-local variables, if subject to apparently reasonable constraints, may fail to reproduce quantum physics. In this paper,
we introduce a family of inequalities, which allow testing Leggetts non-local model versus quantum physics, and which can be tested in an experiment without additional assumptions. Our experimental data falsify Leggetts model and are in agreement with quantum predictions.
