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We report on electron spin resonance spectroscopy measurements using asuperconducting flux qubit with a sensing volume of 6 fl. The qubit is read outusing a frequency-tunable Josephson bifurcation amplifier, which leads to aninferred measurement sensitivity of about 20 spins in a 1 s measurement. Thissensitivity represents an order of magnitude improvement when compared withflux-qubit schemes using a dc-SQUID switching readout. Furthermore, noisespectroscopy reveals that the sensitivity is limited by flicker ($1/f$) fluxnoise.

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