Electron Spin Resonance with up to 20 Spin Sensitivity Measured using a Superconducting Flux Qubit

• URL: http://arxiv.org/abs/2003.09131v1
• Date: Fri, 20 Mar 2020 07:44:12 GMT
• Title: Electron Spin Resonance with up to 20 Spin Sensitivity Measured using a Superconducting Flux Qubit
• Authors: Rangga P. Budoyo, Kosuke Kakuyanagi, Hiraku Toida, Yuichiro Matsuzaki, Shiro Saito
• Abstract summary: We report on electron spin resonance spectroscopy measurements using a superconducting flux qubit with a sensing volume of 6 fl. The sensitivity represents an order of magnitude improvement when compared with flux-qubit schemes using a dc-SQUID switching readout.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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