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Proc Natl Acad Sci U S A. 2017 Feb 28;114(9):2149-2153. doi: 10.1073/pnas.1610835114. Epub 2017 Feb 14.

Quantum interpolation for high-resolution sensing.

Author information

1
Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139.
2
Department of Nuclear Science & Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.
3
Singapore University of Technology and Design, 487372 Singapore.
4
Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139; pcappell@mit.edu.

Abstract

Recent advances in engineering and control of nanoscale quantum sensors have opened new paradigms in precision metrology. Unfortunately, hardware restrictions often limit the sensor performance. In nanoscale magnetic resonance probes, for instance, finite sampling times greatly limit the achievable sensitivity and spectral resolution. Here we introduce a technique for coherent quantum interpolation that can overcome these problems. Using a quantum sensor associated with the nitrogen vacancy center in diamond, we experimentally demonstrate that quantum interpolation can achieve spectroscopy of classical magnetic fields and individual quantum spins with orders of magnitude finer frequency resolution than conventionally possible. Not only is quantum interpolation an enabling technique to extract structural and chemical information from single biomolecules, but it can be directly applied to other quantum systems for superresolution quantum spectroscopy.

KEYWORDS:

NV centers; nanoscale NMR; quantum control; quantum sensing

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