Quantum Sensing of Magnetic Fields with Molecular Spins

Abstract

Spins are prototypical systems with the potential to probe magnetic fields down to the atomic scale limit. Exploiting their quantum nature through appropriate sensing protocols allows to enlarge their applicability to fields not always accessible by classical sensors. Here we first show that quantum sensing protocols for AC magnetic fields can be implemented on molecular spin ensembles embedded into hybrid quantum circuits. We then show that, using only echo detection at microwave frequency and no optical readout, Dynamical Decoupling protocols synchronized with the AC magnetic fields can enhance the sensitivity up to $S=10^{-10}-10^{-9}T/\sqrt{Hz}$ with a low (4-5) number of applied pulses. These results paves the way for the development of strategies to exploit molecular spins as quantum sensors.

arXiv comment11 pages, 5 figures

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• Dephasing-tolerant quantum sensing for transverse magnetic fields with spin qudits
• Observation of Perfect Absorption in Hyperfine Levels of Molecular Spins with Hermitian Subspaces
• Quantum sensing of time-dependent magnetic signals with molecular spins
• Monte Carlo approach for finding optimally controlled quantum gates with differential geometry
• Sensing high-frequency ac fields via a two-qubit sensor
• Discrete time crystal for periodic-field sensing with quantum-enhanced precision