APhMS Special Seminar

**Refreshments outside Noyes at 9:45am

Abstract:

Nitrogen vacancy (NV) centers in diamond are versatile quantum sensors that can be used for high-sensitivity nanoscale magnetometry. Typically, they are used to measure averaged magnetic field values, without accessing nonlocal information like magnetic field correlations across space. In this talk, I will describe covariance magnetometry, a new method we have developed to measure dynamic field correlators, revealing nonlocal magnetic field information across space and time. I will first describe covariance magnetometry using optically resolvable NV centers, which acts as our foundational protocol for measuring two or more NV centers to detect the presence of correlations in fluctuating magnetic fields. I will then describe our recent efforts to scale this method up by performing massively multiplexed readout of many resolvable NV centers simultaneously using high-sensitivity cameras, giving us access to many two-point field correlators at once. Lastly, I will describe super-resolution covariance magnetometry, a new set of methods for detecting nanoscale field correlators below the optical diffraction limit. I will conclude the talk by describing entanglement-based super-resolution covariance magnetometry, in which we use NV center Bell pairs to perform covariance magnetometry with more than an order of magnitude higher sensitivity than is possible using conventional NV center spin readout.

More about the Speaker:

Jared Rovny is an Intelligence Community postdoctoral research fellow studying spin physics and quantum sensing at the Princeton Quantum Initiative working with Prof. Nathalie de Leon. He received his Ph.D. in physics from Yale university working in Prof. Sean Barrett's group, where he studied driven spin systems, solid state magnetic resonance imaging, and sparse sampling algorithms. During his postdoctoral fellowship he spearheaded the development of covariance magnetometry and super-resolution covariance magnetometry, enabling the detection of nanoscale magnetic field dynamics for condensed matter sensing. He has received awards for both his research and outreach, including the Dr. D. Allan Bromley Graduate Fellowship, the Dr. Julia A. Thompson Fellowship, and the Yale Prize Teaching Fellowship.