INRIM, Strada delle Cacce 91, I-10135 Torino, Italy.
Phys Rev Lett. 2013 May 24;110(21):213601. doi: 10.1103/PhysRevLett.110.213601. Epub 2013 May 21.
In recent years quantum correlations have received a lot of attention as a key ingredient in advanced quantum metrology protocols. In this Letter we show that they provide even larger advantages when considering multiple-interferometer setups. In particular, we demonstrate that the use of quantum correlated light beams in coupled interferometers leads to substantial advantages with respect to classical light, up to a noise-free scenario for the ideal lossless case. On the one hand, our results prompt the possibility of testing quantum gravity in experimental configurations affordable in current quantum optics laboratories and strongly improve the precision in "larger size experiments" such as the Fermilab holometer; on the other hand, they pave the way for future applications to high precision measurements and quantum metrology.
近年来，量子相关性作为先进量子计量协议的关键要素受到了广泛关注。在这封信中，我们表明，当考虑多干涉仪设置时，它们提供了更大的优势。特别是，我们证明了在耦合干涉仪中使用量子相关光束会导致相对于经典光的显著优势，对于理想无损耗的情况，甚至可以达到无噪声的情况。一方面，我们的结果提示了在当前量子光学实验室可承受的实验配置中测试量子引力的可能性，并大大提高了“更大规模实验”（如费米实验室 holometer）的精度；另一方面，它们为未来的高精度测量和量子计量应用铺平了道路。
