论文标题
通过实时噪声获取缓解的消毒性缓解
Decoherence mitigation by real-time noise acquisition
论文作者
论文摘要
我们提出了一种方案，以中和量子的经典噪声引起的脱位效应。该方案建立在一个关键思想的基础上：这种噪声可以在量子量演化期间通过经典设备记录，并且可以通过适当的控制序列来撤消其效果，该序列以测量结果为条件。我们在氮呈现（NV）中心上特别证明了该方案，该中心与附近导体中的当前噪声牢固地耦合。通过根据电流的测量来调节可观察的读数，我们恢复了完整的量子相干性及其内在相干时间$ t_2 $。我们证明，该方案提供了一种简单的方法，即使它们是由嘈杂的来源驱动的，以$ 10^{ - 2} $实施单量门门，并且我们估计，如果不增加$ 10^{ - 5} $的不忠行为，则可以达到其他改进。我们预计这种方法可以在实验中使用源自强电流驱动的快速对照脉冲，尤其是在纳米级磁共振成像中，在实验中采用广泛采用，其中需要对峰值电流S的100 Ma的峰值控制，带宽为100 MHz。
We present a scheme to neutralize the dephasing effect induced by classical noise on a qubit. The scheme builds upon the key idea that this kind of noise can be recorded by a classical device during the qubit evolution, and that its effect can be undone by a suitable control sequence that is conditioned on the measurement result. We specifically demonstrate this scheme on a nitrogen-vacancy (NV) center that strongly couples to current noise in a nearby conductor. By conditioning the readout observable on a measurement of the current, we recover the full qubit coherence and its intrinsic coherence time $T_2$. We demonstrate that this scheme provides a simple way to implement single-qubit gates with an infidelity of $10^{-2}$ even if they are driven by noisy sources, and we estimate that an infidelity of $10^{-5}$ could be reached with additional improvements. We anticipate this method to find widespread adoption in experiments using fast control pulses driven from strong currents, in particular in nanoscale magnetic resonance imaging, where control of peak current s of 100 mA with a bandwidth of 100 MHz is required.
