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Electron spin resonance detected by a superconducting qubit

Mon, 2013-11-18 21:47 - Lukas Hanschke
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Date: 
2012-08-10
Author(s): 

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, and P. Bertet

Reference: 

Phys. Rev. B 86, 064514 (2012)

URL: 

http://link.aps.org/doi/10.1103/PhysRevB.86.064514

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 ∼15 μB out of an ensemble of 1011 spins.