论文标题
使用长期腔传递的量子噪声表征理论
Theory of qubit noise characterization using the long-time cavity transmission
论文作者
论文摘要
噪声诱导的分解是对大规模量子计算的主要威胁之一。为了评估影响量子线的噪声，我们超越了通过在系统描述中加入动态噪声，超越了通过量子耦合型腔的标准稳态解决方案。我们为无噪声系统求解量子Langevin方程，并将噪声视为扰动。在长期限制中，可以将校正作为噪声功率频谱密度的卷积总和，该噪声频谱密度与取决于外部控制参数的积分内核。使用卷积定理，我们将校正倒入并获得噪声频谱密度的关系，作为可测量量的积分。此外，我们精确地处理了分散式中的噪声，并再次发现噪声特性在包含功率频谱密度的卷积中的长期传输中都印在了。
Noise induced decoherence is one of the main threats to large-scale quantum computation. In an attempt to assess the noise affecting a qubit we go beyond the standard steady-state solution of the transmission through a qubit-coupled cavity in input-output theory by including dynamical noise in the description of the system. We solve the quantum Langevin equations exactly for a noise-free system and treat the noise as a perturbation. In the long-time limit the corrections may be written as a sum of convolutions of the noise power spectral density with an integration kernel that depends on external control parameters. Using the convolution theorem, we invert the corrections and obtain relations for the noise spectral density as an integral over measurable quantities. Additionally, we treat the noise exactly in the dispersive regime, and again find that noise characteristics are imprinted in the long-time transmission in convolutions containing the power spectral density.
