Dual on-chip SQUID measurement protocol for flux detection in large magnetic fields

Abstract

Sensitive magnetometers that can operate in high magnetic fields are essential for detecting magnetic resonance signals originating from small ensembles of quantum spins. Such devices have potential applications in quantum technologies, in particular quantum computing. We present a novel experimental setup implementing a differential flux measurement using two DC-SQUID magnetometers. The differential measurement allows for cancellation of background flux signals while enhancing sample signal. The developed protocol uses pulsed readout which minimizes on-chip heating since sub-Kelvin temperatures are needed to preserve quantum spin coherence. Results of a proof of concept experiment are shown as well.

5 pages, 6 figures, 1 table

References in corpus (7)

• Will spin-relaxation times in molecular magnets permit quantum information processing?
• Molecular Spin Qudits for Quantum Algorithms
• Inductive-detection electron-spin resonance spectroscopy with $65$spins$/\sqrt{\text{Hz}}$ sensitivity
• A high performance Nb nano-SQUID with a three-dimensional structure
• On-chip SQUID measurements in the presence of high magnetic fields
• Sensitive spin detection using an on-chip SQUID-waveguide resonator
• Forbidden coherent transfer observed between two realizations of quasi-harmonic spin system