Uniaxial Dynamical Decoupling for an Open Quantum System
Uniaxial Dynamical Decoupling for an Open Quantum System
复制标题
开放量子系统的单轴动态解耦
DOI：
10.1103/physrevlett.122.010408
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发表时间：
2019
影响因子：
8.6
通讯作者：
Zhang Wenxian
中科院分区：
文献类型：
--
作者：
Yao Qi;Zhang Jun;Yi Xiao Feng;You Li;Zhang Wenxian
动力学退耦合是抑制量子系统与环境退相干的一种积极有效的方法。与标称双轴DD相比，这项工作提出了一种单轴去耦协议，需要显着减少的脉冲数和低得多的偏置场满足“魔术”条件。我们证明了这种单轴DD协议在许多实际感兴趣的模型系统中有效地工作，例如，杂散磁场中的旋量原子玻色-爱因斯坦凝聚（经典噪声），或者半导体量子点中的电子自旋耦合到核自旋（量子噪声）。它只需要一半数量的控制脉冲和低10-100倍的偏置场用于去耦，如在上述说明性示例中通常采用的那样，并且总体功效对于控制脉冲的旋转误差是鲁棒的。我们提出的单轴DD协议为量子计算和量子信息处理、量子计量学和低场核磁共振中的相干控制提供了新的思路。
Dynamical decoupling (DD) is an active and effective method for suppressing decoherence of a quantum system from its environment. In contrast to the nominal biaxial DD, this work presents a uniaxial decoupling protocol that requires a significantly reduced number of pulses and a much lower bias field satisfying the “magic” condition. We show this uniaxial DD protocol works effectively in a number of model systems of practical interest, e.g., a spinor atomic Bose-Einstein condensate in stray magnetic fields (classical noise), or an electron spin coupled to nuclear spins (quantum noise) in a semiconductor quantum dot. It requires only half the number of control pulses and a 10–100 times lower bias field for decoupling as normally employed in the above mentioned illustrative examples, and the overall efficacy is robust against rotation errors of the control pulses. The uniaxial DD protocol we propose shines new light on coherent controls in quantum computing and quantum information processing, quantum metrology, and low field nuclear magnetic resonance.