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Smooth Optimal Quantum Control for Robust Solid-State Spin Magnetometry.

Tobias Nöbauer1, Andreas Angerer1, Björn Bartels2

  • 1Vienna Center for Quantum Science and Technology and Atominstitut, Vienna University of Technology (TU Wien), Stadionallee 2, 1020 Vienna, Austria.

Physical Review Letters
|November 21, 2015
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Summary
This summary is machine-generated.

We developed a robust quantum control method for nitrogen-vacancy centers, enhancing sensitivity in magnetometry. This technique minimizes errors and bandwidth, improving performance even with control amplitude drops.

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Area of Science:

  • Quantum Control
  • Quantum Sensing
  • Diamond Nitrogen-Vacancy Centers

Background:

  • Nitrogen-vacancy (NV) centers in diamond are promising qubits for quantum sensing.
  • Existing quantum control techniques often lack robustness against experimental imperfections like qubit inhomogeneities and control errors.
  • Achieving high sensitivity in NV-center-based magnetometry requires precise control and mitigation of environmental noise.

Purpose of the Study:

  • To demonstrate a versatile optimal quantum control technique.
  • To achieve tailored robustness against qubit inhomogeneities and control errors.
  • To apply and verify the technique for NV-center magnetometry with minimal bandwidth requirements.

Main Methods:

  • Experimental demonstration of a novel optimal quantum control technique.
  • Application of the technique to nitrogen-vacancy centers in diamond.
  • Verification of performance using quantum process tomography.
  • Implementation in a wide-field NV center magnetometry setup.

Main Results:

  • Achieved tailored robustness against qubit inhomogeneities and control errors.
  • Demonstrated homogeneous sensitivity across a 33% drop in control amplitude.
  • Improved sensitivity by up to 2 orders of magnitude for a normalized detuning of 40%.
  • Reached a sensitivity of 20 nT Hz(-1/2) μm(3/2) in sensitivity times square root volume.

Conclusions:

  • The developed quantum control technique is simple, versatile, and robust.
  • The technique significantly enhances sensitivity in NV-center magnetometry.
  • Minimal bandwidth requirements make the technique practical for various quantum applications.