Proposal for detecting a single electron spin in a microwave resonator

P. Haikka 1, * Y. Kubo 2, 3 A. Bienfait 3 Patrice Bertet 3 K. Mølmer 1, *
* Corresponding author
3 QUANTRONICS - Quantronics Group
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : We propose a method for detecting the presence of a single spin in a crystal by coupling it to a high-quality factor superconducting planar resonator. By confining the microwave field in the vicinity of a constriction of nanometric dimensions, the coupling constant can be as high as 5–10 kHz. This coupling affects the amplitude of the field reflected by the resonator and the integrated homodyne signal allows detection of a single spin with unit signal-to-noise ratio within few milliseconds. We further show that a stochastic master equation approach and a Bayesian analysis of the full time-dependent homodyne signal improves this figure by ∼30% for typical parameters.
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P. Haikka, Y. Kubo, A. Bienfait, Patrice Bertet, K. Mølmer. Proposal for detecting a single electron spin in a microwave resonator. Physical Review A, American Physical Society, 2017, 95, pp.22306. ⟨10.1103/PhysRevA.95.022306⟩. ⟨cea-01491278⟩

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