标题： 一量子比特系统中1/ f 噪声的抑制 显示英文标题

标题： Suppression of 1/f noise in one-qubit systems

摘要： 我们研究了一比特量子系统在具有1/ f^\alpha 功率谱的经典噪声下的量子操作生成问题，其中2>\alpha > 0。 我们提出了一种有效的方法来用离散的多状态马尔可夫涨落器近似这种噪声。 通过这种方法，可以从最近推导出的确定性主方程中实际确定在一/ f^\alpha 噪声下量子比特密度矩阵的平均时间演化。 我们使用基于梯度的优化算法，以高保真度获得了量子比特操作，如量子存储和NOT门。 对于NOT门，计算得到的保真度与之前随机打字机噪声获得的结果在定性上相似。 然而，在量子存储的情况下，我们观察到保真度对操作时间的依赖关系是非单调的，从而自然地得到了存储的访问速率。 显示英文摘要

摘要： We investigate the generation of quantum operations for one-qubit systems under classical noise with 1/f^\alpha power spectrum, where 2>\alpha > 0. We present an efficient way to approximate the noise with a discrete multi-state Markovian fluctuator. With this method, the average temporal evolution of the qubit density matrix under 1/f^\alpha noise can be feasibly determined from recently derived deterministic master equations. We obtain qubit operations such as quantum memory and the NOT}gate to high fidelity by a gradient based optimization algorithm. For the NOT gate, the computed fidelities are qualitatively similar to those obtained earlier for random telegraph noise. In the case of quantum memory however, we observe a nonmonotonic dependency of the fidelity on the operation time, yielding a natural access rate of the memory.