论文标题
瞬态腔传输中量子噪声的指纹
Fingerprints of Qubit Noise in Transient Cavity Transmission
论文作者
论文摘要
噪声会影响量子位的连贯性，从而将量子计算机的性能束缚。从理论上讲，我们在光子腔中研究具有波动控制参数的通用两级系统，发现噪声频谱密度的基本特征在通过空腔的瞬态传输中印在瞬时传播中。我们获得了通用噪声的分析表达式，并继续研究了准确的，白色和$ 1/f^α$噪声的案例。此外，我们提出了一种方法，可以在仅受量子 - 腔失调范围以及由于有限的测量时间而导致的衰减误差范围的频带中提取频谱密度。我们的结果表明，测量时间依赖性传输概率代表了提取噪声特征的新方法。
Noise affects the coherence of qubits and thereby places a bound on the performance of quantum computers. We theoretically study a generic two-level system with fluctuating control parameters in a photonic cavity and find that basic features of the noise spectral density are imprinted in the transient transmission through the cavity. We obtain analytical expressions for generic noise and proceed to study the cases of quasistatic, white and $1/f^α$ noise in more detail. Additionally, we propose a way of extracting the spectral density for arbitrary noise in a frequency band only bounded by the range of the qubit-cavity detuning and with an exponentially decaying error due to finite measurement times. Our results suggest that measurements of the time-dependent transmission probability represent a novel way of extracting noise characteristics.
