Lobino Mirko, Korystov Dmitry, Kupchak Connor, Figueroa Eden, Sanders Barry C, Lvovsky A I
Institute for Quantum Information Science, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
Science. 2008 Oct 24;322(5901):563-6. doi: 10.1126/science.1162086. Epub 2008 Sep 25.
The technologies of quantum information and quantum control are rapidly improving, but full exploitation of their capabilities requires complete characterization and assessment of processes that occur within quantum devices. We present a method for characterizing, with arbitrarily high accuracy, any quantum optical process. Our protocol recovers complete knowledge of the process by studying, via homodyne tomography, its effect on a set of coherent states, that is, classical fields produced by common laser sources. We demonstrate the capability of our protocol by evaluating and experimentally verifying the effect of a test process on squeezed vacuum.
量子信息和量子控制技术正在迅速发展，但要充分发挥其能力，需要对量子设备中发生的过程进行全面表征和评估。我们提出了一种以任意高精度表征任何量子光学过程的方法。我们的协议通过零差层析成像研究其对一组相干态（即由普通激光源产生的经典场）的影响，从而恢复对该过程的完整了解。我们通过评估和实验验证测试过程对压缩真空的影响，展示了我们协议的能力。
