Magnetic Resonance with Squeezed Microwaves
Magnetic Resonance with Squeezed Microwaves
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DOI：
10.1103/physrevx.7.041011
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发表时间：
2017-10-17
影响因子：
12.5
通讯作者：
Bertet, P.
中科院分区：
文献类型：
--
作者：
Bienfait, A.;Campagne-Ibarcq, P.;Bertet, P.
电磁场的真空波动对各种测量的灵敏度设置了基本限制，包括磁共振光谱。我们报告使用的压缩微波场，这是工程量子态的光，在一个字段正交的波动减少到真空水平以下，以提高检测灵敏度的电子自旋在毫开尔文温度的合奏。通过闪耀的压缩真空状态的微波谐振器的输入端口上包含的自旋，我们得到了1.2 dB的噪声降低在光谱仪输出相比，真空输入的情况下。这一结果构成了量子计量学应用于磁共振光谱学的原理证明。
Vacuum fluctuations of the electromagnetic field set a fundamental limit to the sensitivity of a variety of measurements, including magnetic resonance spectroscopy. We report the use of squeezed microwave fields, which are engineered quantum states of light for which fluctuations in one field quadrature are reduced below the vacuum level, to enhance the detection sensitivity of an ensemble of electronic spins at millikelvin temperatures. By shining a squeezed vacuum state on the input port of a microwave resonator containing the spins, we obtain a 1.2-dB noise reduction at the spectrometer output compared to the case of a vacuum input. This result constitutes a proof of principle of the application of quantum metrology to magnetic resonance spectroscopy.