Bouillard M, Boucher G, Ferrer Ortas J, Pointard B, Tualle-Brouri R
Laboratoire Charles Fabry, Institut d'Optique Graduate School, CNRS, Université Paris-Saclay, 2 Avenue Augustin Fresnel, 91127, Palaiseau, France.
Phys Rev Lett. 2019 May 31;122(21):210501. doi: 10.1103/PhysRevLett.122.210501.
Quantum memories are a crucial element toward efficient quantum protocols. In the continuous variables domain, such memories need to provide high fidelity with an efficiency set to one. Moreover, one needs to store complex quantum states exhibiting negative Wigner functions after storage. We report the storage of single- and two-photon Fock states in an all-optical quantum memory. The Wigner functions of these states show negativity after a storage time of several hundred nanoseconds. This is, to our knowledge, the first demonstration of the storage in the optical domain of non-Gaussian states with more than one photon, captured from an external source and characterized with homodyne detection.
量子存储器是实现高效量子协议的关键要素。在连续变量领域，此类存储器需要以设定为1的效率提供高保真度。此外，还需要存储在存储后呈现负维格纳函数的复杂量子态。我们报告了在全光量子存储器中对单光子和双光子福克态的存储。这些态的维格纳函数在几百纳秒的存储时间后呈现出负性。据我们所知，这是首次展示从外部源捕获并用零差检测表征的具有多个光子的非高斯态在光域中的存储。
