Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 41: Poster: Quantum Sensing

FM 41.23: Poster

Tuesday, September 24, 2019, 16:30–18:30, Tents

Quantum Sensing of Microwave Magnetic Fields with Sensor Unlimited Resolution — •Jonas Meinel, Vadim Vorobyov, Boris Yavkin, Durga Dasari, and Jörg Wrachtrup — Universität Stuttgart, 3. Physikalisches Institut, Stuttgart, Germany

Diamond quantum sensors are sensitive to weak microwave magnetic fields resonant to the transitions in the quantum system [1]. The state of the art sensing protocols improved the sensors spectral resolution beyond T2* and are ultimately limited by T1. Here we demonstrate that heterodyne detection methods, widely applied for quantum sensing of radio frequency fields [2], could be extended to the microwave regime. We use phase control of the initial pulses of the sequences, which allows to create correlations between consecutive measurements. We show experimentally a Fourier limited linewidth for a single frequency source. Additional we resolve two 500 Hz separated frequencies demonstrating a corresponding spectral resolution beyond coherence time of the sensor. This work allows to sense ultra long coherent microwave fields, e.g. maser radiation, using a quantum sensor with a wide tuning range covering the full microwave spectrum (1 - 100 GHz).

[1] Joas, Timo, et al. "Quantum sensing of weak radio-frequency signals by pulsed Mollow absorption spectroscopy." Nature communications 8.1 (2017): 964. [2] Schmitt, Simon, et al. "Submillihertz magnetic spectroscopy performed with a nanoscale quantum sensor." Science 356.6340 (2017): 832-837.