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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Narrow-bandwidth sensing of high-frequency fields with continuous dynamical decoupling.

Alexander Stark1,2, Nati Aharon3, Thomas Unden4

  • 1Department of Physics, Technical University of Denmark, Fysikvej, Kongens Lyngby, 2800, Denmark. astark@fysik.dtu.dk.

Nature Communications
|October 21, 2017
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Summary
This summary is machine-generated.

Researchers extended high-frequency AC field sensing to the entire spectrum by incorporating dynamical decoupling. This breakthrough enhances sensitivity in systems like nitrogen-vacancy centers, enabling detection of weaker magnetic fields.

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Area of Science:

  • Quantum Sensing
  • Solid-State Physics
  • Electromagnetics

Background:

  • Current methods for sensing alternating current (AC) fields are limited to low frequencies (<10 MHz).
  • High-frequency signal sensing is inefficient due to the inability to employ dynamical decoupling techniques.
  • This limitation hinders sensitive detection of AC fields across a broader electromagnetic spectrum.

Purpose of the Study:

  • To demonstrate the integration of dynamical decoupling into high-frequency sensing schemes.
  • To extend the high sensitivity achieved in low-frequency sensing to the entire frequency spectrum.
  • To experimentally validate the proposed scheme using a specific quantum system.

Main Methods:

  • Incorporation of dynamical decoupling techniques into sensing protocols.
  • Experimental demonstration using nitrogen-vacancy (NV) centers in diamond.
  • Utilizing NV centers with natural abundance of 13C for coherence time measurements.

Main Results:

  • Achieved coherence times up to 1.43 milliseconds in natural abundance 13C diamond.
  • Demonstrated a smallest detectable magnetic field strength of 4 nT at 1.6 GHz.
  • Observed an intrinsic increase in coherence time attributed to the sensing signal itself.

Conclusions:

  • Dynamical decoupling can be effectively integrated into high-frequency sensing.
  • This approach extends high-sensitivity AC field detection across the entire frequency spectrum.
  • The nitrogen-vacancy center in diamond serves as a viable platform for this advanced sensing technique.