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OSA Quantum 2.0 Conference

NV- Center Magnetometry Speed Up by an Order of Magnitude Using Optimal Bayesian Experimental Design

Sergey Dushenko, Kapildeb Ambal, R. D. McMichael

Published Jan 1, 2020• 0 citations
Publisher

Abstract

In magnetometry using quantum defects in diamond (NV- centers), we demonstrate order-of-magnitude speedup with optimal Bayesian experimental design as compared with conventional frequency-swept measurements.
DOI
10.1364/quantum.2020.qtu8b.15

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Nitrogen-vacancy (NV) centers in diamond are a promising platform for ambient, high-spatial resolution magnetometry relevant to biological signals such as cardiac and muscle activity. One of the challenges is the development of pulse sequences tailored to biological signals in the near DC-range. The spatial environment of NV centers within the diamond lattice is highly complex, e.g. due to magnetic field inhomogeneities, limiting the sensors performance. To overcome these experimental constraints, quantum optimal control (QOC) aims at a precise manipulation of the systems dynamics via optimally shaped microwave pulses increasing the overall robustness of spin-based quantum sensors.
We experimentally demonstrate a simple yet versatile optimal quantum control technique that achieves tailored robustness against qubit inhomogeneities and control errors while requiring minimal bandwidth. We apply the technique to nitrogen-vacancy (NV) centers in diamond and verify its performance using quantum process tomography. In a wide-field NV center magnetometry scenario, we achieve a homogeneous sensitivity across a 33% drop in control amplitude, and we improve the sensitivity by up to 2 orders of magnitude for a normalized detuning as large as 40%, achieving a value of 20 nT Hz(-1/2) μm(3/2) in sensitivity times square root volume.
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