2016/10/31 by A. Bienfait, P. Campagne-Ibarcq, A. H. Kiilerich +12 · 76 citations
Computer Science · Physics and Astronomy · #Atomic and Subatomic Physics Research #Magnetic field #Mechanical and Optical Resonators #Microwave #Microwave cavity #Quantum #Quantum Information and Cryptography #Quantum limit #Resonator #Sensitivity (control systems) #Spins #Squeezed coherent state #Vacuum state #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevx.7.041011
published in Physical Review X 7(4) (American Physical Society) · Main text : 19 pages, 6 figures. Followed by a 18-pages Supplementary Information section, which includes 6 Supplementary Figures
openalex created_date 2016/10/21 · openalex publication_date 2017/10/17 · arxiv created 2017/10/27 · arxiv updated 2017/10/30 · openalex updated_date 2026/08/05
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.