Characteristics of a superconducting single-photon detector shielded by ITO under external electric field conditions
Sedykh K. O.1,2, Suleimen Y.3,4, Svyatodukh S. S.1,3, Zarutskiy S. Yu.4, Podlesnyy A. S.4, Golikov A. D.2,3, Florya I. N.2, Kovalyuk V. V.1,2, Lakhmanskiy K. E.4, Goltsman G. N.1,4
1National Research University Higher School of Economics, Moscow, Russia
2National University of Science and Technology MISiS, Moscow, Russia
3Moscow Pedagogical State University, Moscow, Russia
4Russian Quantum Center, Moscow, Russia
Email: ksedykh@hse.ru
In this work, a model of a surface ion trap with radio-frequency (RF) electrodes and a superconducting single-photon detector made of niobium nitride shielded by indium-tin oxide (ITO) at a temperature of 2.2 K was investigated. The amplitude of the radio-frequency signal supplied to the electrodes varied within 0.01-2 V at frequencies of 5-35 MHz. The results of the dependence of the dark count rate and detection efficiency of the single-photon detector on the induced external RF- field with a shielded ITO coating are presented. Keywords: surface ion trap, superconducting single-photon detector, niobium nitride (NbN), shielding, indium tin oxide (ITO), scalable ion quantum computer.
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