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Optimized Dynamical Decoupling In A Model Quantum Memory

机译：模型量子存储器中的优化动态解耦

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Any quantum system, such as those used in quantum information or magnetic resonance, is subject to random phase errors that can dramatically affect the fidelity of a desired quantum operation or measurement. In the context of quantum information, quantum error correction techniques have been developed to correct these errors, but resource requirements are extraordinary. The realization of a physically tractable quantum information system will therefore be facilitated if qubit (quantum bit) error rates are far below the so-called fault-tolerance error threshold, predicted to be of the order of 10~(-3)-10~(-6). The need to realize such low error rates motivates a search for alternative strategies to suppress dephasing in quantum systems. Here we experimentally demonstrate massive suppression of qubit error rates by the application of optimized dynamical decoupling pulse sequences, using a model quantum system capable of simulating a variety of qubit technologies. We demonstrate an analytically derived pulse sequence, UDD, and find novel sequences through active, real-time experimental feedback. The latter sequences are tailored to maximize error suppression without the need for a priori knowledge of the ambient noise environment, and are capable of suppressing errors by orders of magnitude compared to other existing sequences (including the benchmark multi-pulse spin echo). Our work includes the extension of a treatment to predict qubit decoherence under realistic conditions, yielding strong agreement between experimental data and theory for arbitrary pulse sequences incorporating nonidea-lized control pulses. These results demonstrate the robustness of qubit memory error suppression through dynamical decoupling techniques across a variety of qubit technologies.
机译：任何量子系统，例如在量子信息或磁共振中使用的系统，都会受到随机相位误差的影响，这些随机相位误差会极大地影响所需量子操作或测量的保真度。在量子信息的背景下，已经开发了量子误差校正技术来校正这些误差，但是资源要求非常高。因此，如果量子位（量子位）的错误率远低于所谓的容错错误阈值（预计约为10〜（-3）-10〜），那么将有助于实现物理可处理的量子信息系统。 （-6）。实现如此低的错误率的需求促使人们寻求替代策略来抑制量子系统中的相移。在这里，我们使用能够模拟各种量子位技术的模型量子系统，通过优化动态解耦脉冲序列的应用，实验性地证明了对量子位误码率的大规模抑制。我们演示了解析得出的脉冲序列UDD，并通过主动，实时的实验反馈找到了新颖的序列。调整后一个序列以最大程度地抑制错误，而无需先验环境噪声环境，并且与其他现有序列（包括基准多脉冲自旋回波）相比，能够将误差抑制几个数量级。我们的工作包括扩展一种处理方法，以预测现实条件下的量子比特去相干性，从而使实验数据与理论上对于结合了非理想化控制脉冲的任意脉冲序列产生强烈的一致性。这些结果证明了通过跨各种qubit技术的动态解耦技术来实现qubit存储器错误抑制的鲁棒性。

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