On-demand generation of background-free single photons from a solid-state source
On-demand generation of background-free single photons from a solid-state source
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DOI：
10.1063/1.5020038
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发表时间：
2018-02-26
影响因子：
4
通讯作者：
Zwiller, Val
中科院分区：
文献类型：
--
作者：
Schweickert, Lucas;Jons, Klaus D.;Zwiller, Val
真正的按需高重复率单光子源在量子信息处理应用中受到高度追捧。然而，任何相干驱动的二能级量子系统在脉冲激发下都会遭受有限的再激发概率，从而导致不期望的多光子发射。在这里，我们提出了一个固态源的按需单光子产生的原始二阶相干g（（2））（0）=（7.5 +/- 1.6）× 10（-5）没有任何背景扣除或数据处理。到目前为止，这是任何单光子源的g（（2））（0）的最低值，即使与以前报道的最佳背景扣除值相比。我们在嵌入低Q平面腔中的GaAs/AlGaAs量子点上实现了这一结果，采用（i）双光子激发过程和（ii）滤波和检测装置，其特征在于两个超导单光子探测器，其超低暗计数率分别为（0.0056 +/- 0.0007）s（-1）和（0.017 +/- 0.001）s（-1）。再激发过程被（i）显著抑制，而（ii）去除了导致可忽略的低噪声基底的假重合。(C)2018年作者。
True on-demand high-repetition-rate single-photon sources are highly sought after for quantum information processing applications. However, any coherently driven two-level quantum system suffers from a finite re-excitation probability under pulsed excitation, causing undesirable multi-photon emission. Here, we present a solid-state source of on-demand single photons yielding a raw second-order coherence of g((2)) (0) = (7.5 +/- 1.6) x 10(-5) without any background subtraction or data processing. To this date, this is the lowest value of g((2)) (0) Peported for any single-photon source even compared to the previously reported best background subtracted values. We achieve this result on GaAs/AlGaAs quantum dots embedded in a low-Q planar cavity by employing (i) a two-photon excitation process and (ii) a filtering and detection setup featuring two superconducting single-photon detectors with ultralow dark-count rates of (0.0056 +/- 0.0007) s(-1) and (0.017 +/- 0.001) s(-1), respectively. Re-excitation processes are dramatically suppressed by (i), while (ii) removes false coincidences resulting in a negligibly low noise floor. (C) 2018 Author(s).