Submillihertz magnetic spectroscopy performed with a nanoscale quantum sensor
Submillihertz magnetic spectroscopy performed with a nanoscale quantum sensor
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DOI：
10.1126/science.aam5532
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发表时间：
2017-05-26
期刊：
影响因子：
56.9
通讯作者：
Jelezko, Fedor
中科院分区：
文献类型：
--
作者：
Schmitt, Simon;Gefen, Tuvia;Jelezko, Fedor
精确的计时是计量学的关键，是确定时间、长度和基本常量标准的基础。稳定的时钟在光谱学中特别有价值，因为它们定义了可以达到的最终频率精度。在量子计量学中，量子比特相干时间定义了时钟的稳定性，由此可以确定谱线宽度和频率精度。我们展示了一种量子感知协议，在该协议中，频谱精度超出了传感器的相干时间，并且受到经典时钟的稳定性的限制。利用这一技术，我们观察到经典振荡场在时间T上的频率估计标度精度为T-3/2。基于钻石单自旋的窄线宽磁强计用于探测纳米尺度的磁场，其固有频率分辨率为607微赫兹，比量子比特相干时间窄8个数量级。
Precise timekeeping is critical to metrology, forming the basis by which standards of time, length, and fundamental constants are determined. Stable clocks are particularly valuable in spectroscopy because they define the ultimate frequency precision that can be reached. In quantum metrology, the qubit coherence time defines the clock stability, from which the spectral linewidth and frequency precision are determined. We demonstrate a quantum sensing protocol in which the spectral precision goes beyond the sensor coherence time and is limited by the stability of a classical clock. Using this technique, we observed a precision in frequency estimation scaling in time T as T-3/2 for classical oscillating fields. The narrow linewidth magnetometer based on single spins in diamond is used to sense nanoscale magnetic fields with an intrinsic frequency resolution of 607 microhertz, which is eight orders of magnitude narrower than the qubit coherence time.