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Modern single-photon detectors based on avalanche photodiodes offerincreasingly higher triggering speeds, thus fostering their use in severalfields, prominently in the recent area of Quantum Key Distribution. To reducethe probability of an afterpulse, these detectors are usually equipped with acircuitry that disables the trigger for a certain time after a positivedetection event, known as dead time. If the acquisition system connected to thedetector is not properly designed, efficiency issues arise when the triggeringrate is faster than the inverse of detector's dead-time. Moreover, when thishappens with two or more detectors used in coincidence, a security risk called"self-blinding" can jeopardize the distribution of a secret quantum key. Inthis paper we introduce a trigger-disabling circuitry based on an FPGA-drivenfeedback loop, so to avoid the above-mentioned inconveniences. In the regime ofsingle-photon-attenuated light, the electronics dynamically accept a triggeronly after detectors' complete recovery from dead-time. This technique provesuseful to work with detectors at their maximum speed and to increase thesecurity of a quantum key distribution setup.

Trigger-disabling Acquisition System for Quantum Key Distribution failsafe against Self-blinding