An Er3+ spin sensor in CaWO4 measures the hyperfine NMR spectrum of a single 93Nb nuclear spin-9/2 with Hertz resolution, determining its site, position, quadrupolar tensor, and two new terms in the spin Hamiltonian.
URL https://arxiv.org/abs/2408.14282
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Transmon qubit microwave photon counter with bandwidth tuning achieves 3e-23 W/sqrt(Hz) sensitivity, confirmed by single spin fluorescence measurement.
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Precision hyperfine spectroscopy of an individual nuclear-spin-9/2
An Er3+ spin sensor in CaWO4 measures the hyperfine NMR spectrum of a single 93Nb nuclear spin-9/2 with Hertz resolution, determining its site, position, quadrupolar tensor, and two new terms in the spin Hamiltonian.
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Enhancing the sensitivity of single microwave photon detection with bandwidth tunability
Transmon qubit microwave photon counter with bandwidth tuning achieves 3e-23 W/sqrt(Hz) sensitivity, confirmed by single spin fluorescence measurement.