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Capacitive readout and gating of superconducting single photon detectors
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Simulation diagram and (b) experimental setup. The pulse is a recorded detection of a striking photon without a capacitor. (c) The bias voltage ( ), voltage pulses driving the laser diode ( ), a single shot capacitor voltage readout measurement ( ) and simulation result ( ). The bias voltage is scaled down by a factor of 10.

Image of FIG. 2.
FIG. 2.

(a) Experimental setup for gating. The electrical readout is represented by the driver box. The electronic circuit box is composed of a pulse stretcher (50 ns wide TTL signal) connected in series to an inverter (PicoQuant SIA 400, In TTL, Out ∼300 mV), an 80 dB attenuator (Mini Circuits ZX73-2500), a low pass filter (Mini Circuits, BLP25) and a 500 Ω resistor. (b) Gating and measured signals. The APD detection pulse (APD), scaled by a factor 0.02, was reshaped by the electronics box into a 50 ns inverted gate pulse (Gate). The gate pulse is scaled up by a factor of 100. A regular detection event without gating the SSPD (Regular) and an event occurring when a gate pulse is applied (Gated).

Image of FIG. 3.
FIG. 3.

Gated operation of the SSPD. (a) Detection events as a function of optical delay of the heralded photon. The reference shows detection events for a 7 m fiber optical delay without gating, i.e., without the use of APD. Therefore, the gating envelope of 50 ns is non-occurring and the reference curve is flat. (b) Detection events as a function of gate pulse delay. When the heralded photon falls outside the gate window (lowest trace) there are no correlated detection events.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Capacitive readout and gating of superconducting single photon detectors