Multiplexed Scanning Microscopy with Dual-Qubit Spin Sensors
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2025-10-06 |
| Journal | Physical Review Letters |
| Authors | William S. Huxter, Federico Dalmagioni, Christian L. Degen |
| Institutions | ETH Zurich |
Abstract
Section titled āAbstractāScanning probe microscopy with multiqubit sensors offers the potential to improve imaging speed and measure previously inaccessible quantities, such as two-point correlations. We develop a multiplexed quantum sensing approach with scanning probes containing two nitrogen-vacancy (NV) centers at the tip apex. A shared optical channel is used for simultaneous qubit initialization and readout, while phase- and frequency-dependent microwave spin manipulations are leveraged for demultiplexing the optical readout signal. Scanning dual-NV magnetometry is first demonstrated by simultaneously imaging multiple field projections of a ferrimagnetic racetrack device. Then, we record the two-point covariance of spatially correlated field fluctuations across a current-carrying wire. Our multiplex framework establishes a method to investigate a variety of spatiotemporal correlations, including phase transitions and electronic noise, with nanoscale resolution.