2020/11/30 by M. S. Ebrahimi, Mehri Sadat Ebrahimi, Ali Motazedifard +2
Engineering · Physics and Astronomy · #Amplifier #Atomic and Subatomic Physics Research #CMOS #Electronic engineering #Engineering #Gradiometer #Magnetic field #Magnetometer #Mechanical and Optical Resonators #Microwave #Microwave cavity #Optoelectronics #Physics #Quantum #Quantum and electron transport phenomena #Quantum computer #Quantum limit #Quantum mechanics #Quantum network #Quantum sensor #Sensitivity (control systems) #Squid #quant-ph
paper · pdf · doi:10.1103/physreva.103.062605
published as Phys. Rev. A 103, 062605 (2021) · Accepted in PRA
arxiv created 2021/05/29 · openalex publication_date 2021/06/10 · arxiv updated 2021/06/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A scheme of an ultrasensitive magnetometer in the cavity quantum electromagnonics is proposed, where the intracavity microwave mode is coupled to a magnonic mode via magnetic dipole interaction. It is shown that by driving both magnonic and microwave modes with external classical fields and controlling the system parameters, one can reduce the added noise of magnetic field measurement below the standard quantum limit (SQL). Surprisingly, we show that beyond the rotating wave approximation (RWA), not only can the added noise be suppressed but also the output cavity response to the input signal can be substantially amplified in order to achieve a precise magnetic-field measurement. The estimated theoretical sensitivity of the proposed magnetic amplifier-sensor is approximately on the order of 10^\ensuremath-18\phantom\rule0.28em0exT/√(Hz), which is competitive compared to the current state-of-the-art magnetometers like superconducting quantum interference devices (SQUIDs) and atomic magnetometers. The advantages of the proposed sensor in comparison with the other magnetometers is its high sensitivity at room temperature, sensing in a wide range of frequencies up to MHz, and its capability for signal-response amplification.