Department of Physics, University of Virginia, Charlottesville, Virginia 22903, USA.
Phys Rev Lett. 2011 Jul 15;107(3):030505. doi: 10.1103/PhysRevLett.107.030505. Epub 2011 Jul 14.
Scalability and coherence are two essential requirements for the experimental implementation of quantum information and quantum computing. Here, we report a breakthrough toward scalability: the simultaneous generation of a record 15 quadripartite entangled cluster states over 60 consecutive cavity modes (Q modes), in the optical frequency comb of a single optical parametric oscillator. The amount of observed entanglement was constant over the 60 Q modes, thereby proving the intrinsic scalability of this system. The number of observable Q modes was restricted by technical limitations, and we conservatively estimate the actual number of similar clusters to be at least 3 times larger. This result paves the way to the realization of large entangled states for scalable quantum information and quantum computing.
可扩展性和相干性是量子信息和量子计算实验实现的两个基本要求。在这里，我们报告了一个朝着可扩展性的突破：在单个光参量振荡器的光频梳中，同时产生创纪录的 15 个连续腔模式（Q 模式）的四分体纠缠簇态。在 60 个 Q 模式中，观察到的纠缠量保持不变，从而证明了该系统的固有可扩展性。可观察到的 Q 模式数量受到技术限制的限制，我们保守估计实际类似簇的数量至少大 3 倍。这一结果为实现可扩展的量子信息和量子计算的大纠缠态铺平了道路。
