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arXiv 1807.07709cond-mat.supr-con
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超导纳米线单光子探测器的最小定时抖动

Minimal timing jitter in superconducting nanowire single photon detectors

D. Yu. Vodolazov

摘要:

利用双温度模型和修正的含时Ginzburg-Landau方程,计算了电流偏置超导带材吸收单光子后出现生长正常畴的延迟时间$τ_d$。我们证明了$τ_d$依赖于光子在带中被吸收的位置,并且随着电流的增加而单调减小。我们认为,$τ_d$(定时抖动)的变化,无论是与位置相关的响应或Fano波动,可以小到超导序参量$\sim \hbar/k_BT_c$($T_c$是超导体的临界温度)的最低弛豫时间时,电流接近的depairing电流。

英文摘要:

Using two-temperature model coupled with modified time-dependent Ginzburg-Landau equation we calculate the delay time $τ_d$ in appearance of growing normal domain in the current-biased superconducting strip after absorption of the single photon. We demonstrate that $τ_d$ depends on the place in the strip where photon is absorbed and monotonically decreases with increasing of the current. We argue, that the variation of $τ_d$ (timing jitter), connected either with position-dependent response or Fano fluctuations could be as small as the lowest relaxation time of the superconducting order parameter $\sim \hbar/k_BT_c$ ($T_c$ is the critical temperature of the superconductor) when the current approaches the depairing current.

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