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Electron spin resonance detected by a superconducting qubit

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arxiv 1205.5659 v1 pith:OPDZ5VAN submitted 2012-05-25 quant-ph cond-mat.mes-hallcond-mat.mtrl-sci

Y. Kubo , I. Diniz , C. Grezes , T. Umeda , J. Isoya , H. Sumiya , T. Yamamoto , H. Abe
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S. Onoda T. Ohshima V. Jacques A. Dréau J.-F. Roch A. Auffeves D. Vion D. Esteve P. Bertet
This is my paper · ORCID
classification quant-phcond-mat.mes-hallcond-mat.mtrl-sci
keywords qubitresonancespinsensemblespinsuperconductingabsorptionacts
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A new method for detecting the magnetic resonance of electronic spins at low temperature is demonstrated. It consists in measuring the signal emitted by the spins with a superconducting qubit that acts as a single-microwave-photon detector, resulting in an enhanced sensitivity. We implement this new type of electron-spin resonance spectroscopy using a hybrid quantum circuit in which a transmon qubit is coupled to a spin ensemble consisting of NV centers in diamond. With this setup we measure the NV center absorption spectrum at 30mK at an excitation level of \thicksim15\,\mu_{B} out of an ensemble of 10^{11} spins.

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