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High-Resolution Quantum Sensing with Shaped Control Pulses.

J Zopes1, K Sasaki2, K S Cujia1

  • 1Department of Physics, ETH Zurich, Otto Stern Weg 1, 8093 Zurich, Switzerland.

Physical Review Letters
|January 13, 2018
PubMed
Summary
This summary is machine-generated.

Amplitude-shaped control pulses significantly improve quantum sensing resolution. This technique enhances timing precision to 0.6 picoseconds, enabling advanced detection of magnetic fields and nuclear magnetic resonance signals.

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Area of Science:

  • Quantum Sensing
  • Quantum Information Science
  • Diamond Quantum Technology

Background:

  • Multipulse quantum sensing sequences are crucial for high-precision measurements.
  • Achieving high time and frequency resolution in these sequences is a significant challenge.
  • Existing methods often face limitations in timing accuracy and spectral resolution.

Purpose of the Study:

  • To investigate amplitude-shaped control pulses for enhancing quantum sensing resolution.
  • To demonstrate improved timing and frequency resolution in multipulse quantum sensing.
  • To apply this enhanced method for detecting external magnetic fields and nuclear magnetic resonance signals.

Main Methods:

  • Utilizing the electronic spin of a single nitrogen-vacancy (NV) center in diamond.
  • Employing up to 10,000 coherent microwave pulses with a cosine square envelope.
  • Implementing amplitude-shaped control pulses to refine interpulse delay timing.

Main Results:

  • Achieved a timing resolution of 0.6 picoseconds for interpulse delay, a >3 order of magnitude improvement over 2-ns hardware sampling.
  • Demonstrated high spectral resolution in detecting external ac magnetic fields.
  • Successfully detected nuclear magnetic resonance (NMR) signals from 13C spins with enhanced resolution.

Conclusions:

  • Amplitude-shaped control pulses offer a simple yet powerful method for enhancing quantum sensing.
  • The technique provides significant improvements in timing and spectral resolution for multipulse sequences.
  • This approach is particularly beneficial for quantum applications demanding fast phase gates, numerous control pulses, and high fidelity.