Quantum Sensing and Imaging with Diamond Spins
Abstract: The nitrogen vacancy (NV) center in diamond is an atomic-scale defect in diamond that is highly sensitive to a wide variety of fields: magnetic, electric, thermal, and strain. Here I discuss an NV-based imaging platform (Fig. 1) where we have incorporated an NV center into a scanning probe microscope and used it to image vortices in superconductors  and skyrmions, nanoscale topological spin textures, in thin film magnetic multilayers. A grand challenge to improving the spatial resolution and magnetic sensitivity of the NV is mitigating surface-induced quantum decoherence, which I will discuss in the second part of this talk. Decoherence at interfaces is a universal problem that affects many quantum technologies, but the microscopic origins are as yet unclear. With its sensitivity to electric and magnetic fields over a wide range of frequencies, we have used the NV center as a noise spectrometer to spectroscopically probe sources of surface-related decoherence, differentiating between electric and magnetic origins. These studies guide the ongoing development of quantum control and diamond surface preparation techniques, pushing towards the ultimate goal of NV-based single nuclear spin imaging.
Fig. 1: Schematic of the NV-based scanning probe magnetometer, which operates from room temperature down to 5K. An NV center located within nanometers of the apex of a diamond probe tip is scanned over a system of interest, and records the stray magnetic field.
Bio: Ania Bleszynski Jayich is an associate professor of physics at the University of California Santa Barbara. Her research interests include quantum assisted sensing and imaging on the nanoscale, diamond optomechanics, and hybrid quantum systems for sensing and quantum information. She is developing a novel diamond-based scanning probe magnetometer that aims to achieve single spin sensitivity with nm scale spatial resolution, with an eye towards nanoscale magnetic resonance imaging of biological systems and novel materials for classical and quantum computing.
Ania received her PhD in physics from Harvard in 2006 and a B.S. in physics and mathematical and computational science from Stanford in 2000. Her postdoc was split between Harvard and Yale. She currently holds the Bruker Endowed Chair for Science and Engineering at UCSB. She is also the recipient of the Presidential Early Career Award for Scientists and Engineers, the Air Force Office of Scientific Research Young Investigator Award, and an NSF Career award.
All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.