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Electron Spin Resonance with up to 20 Spin Sensitivity Measured using a Superconducting Flux Qubit
Published 20 Mar 2020 in quant-ph, cond-mat.mes-hall, and cond-mat.supr-con | (2003.09131v1)
Abstract: We report on electron spin resonance spectroscopy measurements using a superconducting flux qubit with a sensing volume of 6 fl. The qubit is read out using a frequency-tunable Josephson bifurcation amplifier, which leads to an inferred measurement sensitivity of about 20 spins in a 1 s measurement. This sensitivity represents an order of magnitude improvement when compared with flux-qubit schemes using a dc-SQUID switching readout. Furthermore, noise spectroscopy reveals that the sensitivity is limited by flicker ($1/f$) flux noise.
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