InGaAs/InP avalanche photodiodes （APD） are rarely used in a free-running regime for near-infrared single photon detection. In order to overcome the detrimental afterpulsing, we demonstrate a passive quenching active...InGaAs/InP avalanche photodiodes （APD） are rarely used in a free-running regime for near-infrared single photon detection. In order to overcome the detrimental afterpulsing, we demonstrate a passive quenching active reset integrated circuit. Taking advantage of the inherent fast passive quenching process and active reset to reduce reset time, the integrated circuit is useful for reducing afterpulses and is also area-efficient. We investigate the free-running single photon detector＇s afterpulsing effect, de-trapping time, dark count rate, and photon detection efficiency, and also compare with gated regime operation. After correction for deadtime and afterpulse, we find that the passive quenching active reset free-running single photon detector＇s performance is consistent with gated operation.展开更多
We demonstrate an active reset protocol in a superconducting quantum circuit.The thermal population on the excited state of a transmon qubit is reduced through driving the transitions between the qubit and an ancillar...We demonstrate an active reset protocol in a superconducting quantum circuit.The thermal population on the excited state of a transmon qubit is reduced through driving the transitions between the qubit and an ancillary qubit.Furthermore,we investigate the efficiency of this approach at different temperatures.The result shows that population in the first excited state can be dropped from 7%to 2.55%in 27 ns at 30 m K.The efficiency improves as the temperature increases.Compared to other schemes,our proposal alleviates the requirements for measurement procedure and equipment.With the increase of qubit integration,the fast reset technique holds the promise of improving the fidelity of quantum control.展开更多
基金supported by the National High Technology Research and Development Program of China(Grant No.2013AA122902)the National Key Scientific Instrument and Equipment Development Project of China(Grant No.2013YQ030595)the National Natural Science Foundation of China(Grant Nos.61274024 and 61474123)
文摘InGaAs/InP avalanche photodiodes （APD） are rarely used in a free-running regime for near-infrared single photon detection. In order to overcome the detrimental afterpulsing, we demonstrate a passive quenching active reset integrated circuit. Taking advantage of the inherent fast passive quenching process and active reset to reduce reset time, the integrated circuit is useful for reducing afterpulses and is also area-efficient. We investigate the free-running single photon detector＇s afterpulsing effect, de-trapping time, dark count rate, and photon detection efficiency, and also compare with gated regime operation. After correction for deadtime and afterpulse, we find that the passive quenching active reset free-running single photon detector＇s performance is consistent with gated operation.
基金the National Key R&D Program of China(Grant No.2016YFA0301802)the National Natural Science Foundation of China(Grant Nos.61521001,11474153,and 11890704)the Key R/D Program of Guangdong Province,China(Grant No.2018B030326001)。
文摘We demonstrate an active reset protocol in a superconducting quantum circuit.The thermal population on the excited state of a transmon qubit is reduced through driving the transitions between the qubit and an ancillary qubit.Furthermore,we investigate the efficiency of this approach at different temperatures.The result shows that population in the first excited state can be dropped from 7%to 2.55%in 27 ns at 30 m K.The efficiency improves as the temperature increases.Compared to other schemes,our proposal alleviates the requirements for measurement procedure and equipment.With the increase of qubit integration,the fast reset technique holds the promise of improving the fidelity of quantum control.
