Quantum non-demolition measurement with measurement and feed-forward

我们成功地创造了高度压缩的光态，我们的压缩水平记录是9分贝。通过使用这种高度压缩的光态，我们成功地创造了高能级的量子纠缠。此外，我们成功地利用量子纠缠和测量以及前馈技术构建了一个万能压缩器；通过将两个万能压缩器和两个分束器相结合，我们成功地建立了量子非摧毁相互作用的装置；最后，我们成功地在两个共轭变量中进行了量子非摧毁测量，并验证了输出之间量子纠缠的存在。

We succeeded in creating highly squeezed states of light and our record of squeezing level was 9 dB. By using such highly squeezed states of light, we succeeded in creating high level of quantum entanglement. Moreover, we succeeded in building a universal squeezer with the high level of quantum entanglement and measurement and feed-forward" technique.By combining two universal squeezers with two beam splitters, we succeeded in building a setup for quantum non-demolition interaction. Finally, we succeeded in quantum non-demolition measurement in two conjugate variables and checked the existence of quantum entanglement between outputs.