论文标题
随机电报噪声对量子位门操作的影响
Influence of Random Telegraph Noise on Quantum Bit Gate Operation
论文作者
论文摘要
我们考虑在存在随机电报噪声（RTN）的情况下分析自旋flip Qubit Gate的问题。我们广泛的方法是以下内容。我们计算由复合脉冲（恒定脉冲（c-pulse），量子井脉冲（QW-Pulse）和屏障电势脉冲（BP-Pulse）驱动的Qubit概率，使用Feynman Disnangling方法。当复合脉冲和RTN分别在x方向和z方向上起作用时，我们计算了达到Qubit的100％自旋flip概率的最佳时间。我们报告了可以使用C-Pulse来实现的自旋flip Qubit的快捷键，其次是BP-Pulse和QW-Pulse。当RTN的跳跃时间非常快时，完美的保真度或自旋flip概率的调整扩展到大的RTN相关时间。另一方面，当RTN中的跳跃非常慢时，可以使用BP-Pulse来恢复失去的保真度。然而，不管RTN跳跃环境如何，可能对量子误差校正有益。对于更一般的情况，我们已经测试了几个脉冲序列，以实现高保真量子门，在那里我们使用了在不同方向上作用的脉冲。从计算中，当分别在x方向，y方向和z方向上，当qw-pulse，bp-pulse和c-pulse Act分别在RTN存在下，我们发现Qubit门的高忠诚度。
We consider the problem of analyzing spin-flip qubit gate operation in presence of Random Telegraph Noise (RTN). Our broad approach is the following. We calculate the spin-flip probability of qubit driven by composite pulses, (Constant pulse (C-pulse), Quantum Well pulse (QW-pulse) and Barrier Potential pulse (BP-pulse)) in the presence of RTN using Feynman disentangling method. When composite pulses and RTN act in x-direction and z-direction respectively, we calculate the optimal time to achieve 100% spin-flip probability of qubit. We report the shortcut of spin-flip qubit, which can be achieved by using C-pulse, followed by BP-pulse and QW-pulse. When jumps time in RTN are very fast, tuning of perfect fidelity or spin-flip probability extends to large RTN correlation time. On the other hand, when the jumps in RTN are very slow, the BP-pulse can be used to recover the lost fidelities. Nevertheless, the fidelities of qubit gate operation are larger than 90%, regardless of RTN jumps environments which may be beneficial in quantum error correction. For more general case, we have tested several pulse sequences for achieving high fidelity quantum gates, where we have used the pulses acting in different directions. From the calculations, we find high fidelity of qubit gate operation in presence of RTN is achieved when QW-pulse, BP-pulse and C-pulse act in x-direction, y-direction and z-direction, respectively.
