Santos Lea F, Viola Lorenza
Department of Physics and Astronomy, Dartmouth College, 6127 Wilder Laboratory, Hanover, New Hampshire 03755, USA.
Phys Rev Lett. 2006 Oct 13;97(15):150501. doi: 10.1103/PhysRevLett.97.150501. Epub 2006 Oct 9.
We demonstrate the advantages of randomization in coherent quantum dynamical control. For systems which are either time-varying or require decoupling cycles involving a large number of operations, we find that simple randomized protocols offer superior convergence and stability as compared to deterministic counterparts. In addition, we show how randomization may allow us to outperform purely deterministic schemes at long times, including combinatorial and concatenated methods. General criteria for optimally interpolating between deterministic and stochastic design are proposed and illustrated in explicit decoupling scenarios relevant to quantum information storage.
我们展示了随机化在相干量子动力学控制中的优势。对于时变系统或需要涉及大量操作的解耦循环的系统，我们发现与确定性方案相比，简单的随机协议具有更好的收敛性和稳定性。此外，我们展示了随机化如何使我们在长时间内超越纯确定性方案，包括组合方法和级联方法。我们提出了在确定性和随机设计之间进行最佳插值的一般标准，并在与量子信息存储相关的显式解耦场景中进行了说明。
