Technische Universität Dortmund, Fakultät Physik, D-44221 Dortmund, Germany.
Phys Rev Lett. 2013 Jul 12;111(2):020503. doi: 10.1103/PhysRevLett.111.020503. Epub 2013 Jul 11.
We report a high fidelity optical memory in which dynamical decoupling is used to extend the storage time. This is demonstrated in a rare-earth doped crystal in which optical coherences were transferred to nuclear spin coherences and then protected against environmental noise by dynamical decoupling, leading to storage times of up to 4.2 ms. An interference experiment shows that relative phases of input pulses are preserved through the whole storage and retrieval process with a visibility ≈1, demonstrating the usefulness of dynamical decoupling for extending the storage time of quantum memories. We also show that dynamical decoupling sequences insensitive to initial spin coherence increase retrieval efficiency.
我们报告了一种高保真光学存储器，其中动态去耦被用于延长存储时间。这在掺稀土晶体中得到了证明，其中光学相干被转移到核自旋相干，然后通过动态去耦来保护它们免受环境噪声的影响，从而实现了长达 4.2 毫秒的存储时间。干涉实验表明，输入脉冲的相对相位在整个存储和检索过程中得到了保留，可见度≈1，证明了动态去耦对于扩展量子存储器的存储时间的有用性。我们还表明，对初始自旋相干不敏感的动态去耦序列可以提高检索效率。
