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We protected a quantum sensor from environmental noise using repeated quantum error correction. This extends magnetic field sensing times beyond natural decoherence limits, showcasing the power of entangled quantum systems.

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Area of Science:

  • Quantum Information Science
  • Quantum Sensing
  • Solid-State Physics

Background:

  • Environmental decoherence limits the performance of quantum sensors.
  • Maintaining quantum coherence is crucial for precise measurements.
  • Hybrid spin systems offer potential for robust quantum technologies.

Purpose of the Study:

  • To demonstrate protection of a hybrid spin register against decoherence.
  • To extend magnetic field sensing times using quantum error correction.
  • To highlight the advantages of entangled multiqubit systems for quantum sensing.

Main Methods:

  • Experimental demonstration of repeated quantum error correction on a hybrid spin register.
  • Utilizing a long-lived nuclear spin to correct phase errors on an electron spin in diamond.
  • Performing magnetic field sensing with the protected spin register.

Main Results:

  • Successful protection of a room-temperature hybrid spin register against environmental decoherence.
  • Achieved magnetic field sensing beyond natural decoherence time scales.
  • Demonstrated universal extension of sensing time, robust to noise.

Conclusions:

  • Repeated quantum error correction effectively shields quantum sensors from environmental noise.
  • Entangled multiqubit systems offer a definitive advantage for robust quantum sensing.
  • This work complements existing quantum control techniques and advances quantum sensing capabilities.