Our new preprint on “Quantum sensing of arbitrary magnetic signals with molecular spins” is now available on ArXiv: arXiv:2509.17144
Abstract: “Molecular spins offer a promising platform for quantum sensing, particularly in organic, supramolecular or biological environments. Detection of periodic magnetic fields has been demonstrated with molecular spins (S = 1/2) using manipulation protocols synchronized with the probed field. In this work, we develop two quantum sensing protocols that enable discrimination between different time-dependent magnetic field signals, without synchronization. These are based on the Hahn echo sequence and have been tested on VO(TPP) and VOPt(SCOPh)4 molecular spins embedded in a superconducting YBCO microwave resonator. We report a magnetic field sensitivity
up to a few 10−7 T Hz−1/2 (with lower bounds approaching 10−8 T Hz−1/2 ) for signals with duration of a few microseconds. Under the given conditions, the minimum signal area that can be measured is in the 10−10 T s range, suggesting a potential trade-off between minimum measurable field and the required signal duration and memory time.“