Genuine randomness from an incoherent source
Genuine randomness from an incoherent source
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发表时间：
2016-11
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通讯作者：
B. Qi
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作者：
B. Qi
量子随机数生成器 (QRNG) 利用测量过程中固有的随机性：鉴于输入状态是测量算子本征态的叠加，测量输出是真正随机的。我们证明，在可信设备的情况下，即使检测器的输入是混合状态，也可以生成真正的随机性。我们提出了一种基于用光学零差探测器测量单模热态正交波动的随机数生成方案。通过分束器处的单模本振对宽带非相干光源进行干涉并进行差分光电检测，借助本振引入的“滤波”功能，我们可以选择性地检测非相干光源单模的正交涨落。实验上，从放大的自发发射源观察到比真空噪声大三个数量级的正交方差，这表明与基于测量真空噪声的 QRNG 相比，该方案可以承受更高的技术噪声。所获取数据的较小相关系数证明了该熵源的高质量。
Quantum random number generators (QRNGs) harness the intrinsic randomness in measurement processes: the measurement outputs are truly random given the input state is a superposition of the eigenstates of the measurement operators. We show in the case of trusted devices, genuine randomness could be generated even when the input to the detector is a mixed state. We propose a random number generation scheme based on measuring the quadrature fluctuations of a single mode thermal state with an optical homodyne detector. By interfering a broadband incoherent source with a single mode local oscillator at a beam splitter and performing differential photodetection, we can selectively detect the quadrature fluctuations of a single mode of the incoherent source, thanks to the "filtering" function introduced by the local oscillator. Experimentally, a quadrature variance about three orders of magnitude larger than the vacuum noise is observed from an amplified spontaneous emission source, suggesting this scheme can tolerate much high technical noises in comparison with QRNGs based on measuring the vacuum noise. The high quality of this entropy source is evidenced by the small correlation coefficients of the acquired data.