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arXiv 1702.02558quant-ph
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利用共轭光学零差探测表征光子数统计

Characterizing photon number statistics using conjugate optical homodyne detection

Bing Qi, Pavel Lougovski, Brian P. Williams

摘要:

研究了用双零差探测器同时测量共轭求积函数来确定未知量子态光子数统计的问题。传统上,两个零差探测器的平方输出之和与输入光的强度(因此光子数)成比例。量子力学上,由于真空噪声,上述光子数测量本质上是有噪声的。我们量化了单次测量中的信息增益,并讨论了这种技术在量子密钥分发中的潜在应用。我们还表明,光子数统计可以恢复在重复测量的合奏相同的输入状态,而不扫描的输入状态的相位或随机化的零差检测中使用的本地振荡器的相位。

英文摘要:

We study the problem of determining the photon number statistics of an unknown quantum state by simultaneously measuring conjugate quadratures with double homodyne detectors. Classically, the sum of the squared outputs of the two homodyne detectors is proportional to the intensity (thus the photon number) of the input light. Quantum mechanically, due to vacuum noise, the above photon number measurement is intrinsically noisy. We quantify the information gain in a single-shot measurement and discuss potential applications of this technology in quantum key distribution. We also show that the photon number statistics can be recovered in repeated measurements on an ensemble of identical input states without scanning the phase of the input state or randomizing the phase of the local oscillator used in homodyne detection.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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