Electron spin resonance with up to 20 spin sensitivity measured using a superconducting flux qubit
Rangga P. Budoyo, Kosuke Kakuyanagi, Hiraku Toida, Yuichiro Matsuzaki, Shiro Saito
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 to flux-qubit schemes using a direct current-superconducting quantum interference device switching readout. Furthermore, noise spectroscopy reveals that the sensitivity is limited by flicker (1/f) flux noise.
Topics & Concepts
Flux qubitSpinsCondensed matter physicsPhysicsSensitivity (control systems)QubitSuperconductivityPhase qubitSpin (aerodynamics)Charge qubitNoise (video)Flux (metallurgy)Magnetic fluxResonance (particle physics)SpectroscopyMagnetic flux quantumJosephson effectSuperconducting quantum computingElectronAtomic physicsNuclear magnetic resonanceQuantumQuantum fluctuationQuantum computerResolution (logic)Quantum Information and CryptographyQuantum and electron transport phenomenaPhysics of Superconductivity and Magnetism