Electron spin resonance detected by a superconducting qubit

Y. Kubo; I. Diniz; C. Grezes; T. Umeda; J. Isoya; H. Sumiya; T. Yamamoto; H. Abe; S. Onoda; T. Ohshima; V. Jacques; A. Dréau; J.-F. Roch; A. Auffeves; D. Vion; D. Esteve; P. Bertet

doi:10.1103/PhysRevB.86.064514

Electron spin resonance detected by a superconducting qubit

Y. Kubo, I. Diniz, C. Grezes, T. Umeda, J. Isoya, H. Sumiya, T. Yamamoto, H. Abe, S. Onoda, T. Ohshima, V. Jacques, A. Dréau, J.-F. Roch, A. Auffeves, D. Vion, D. Esteve, P. Bertet

DOI 10.1103/PhysRevB.86.064514 · Physical Review B

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Abstract

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 such an electron-spin resonance spectrometer using a hybrid quantum circuit in which a transmon qubit is coupled to a spin ensemble consisting of nitrogen-vacancy (NV) centers in diamond. With this setup we measure the NV center absorption spectrum at 30 mK at an excitation level of ∼15μB out of an ensemble of 1011 spins.