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Sequential Measurements for Quantum-Enhanced Magnetometry in Spin Chain Probes.

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This study introduces a new quantum sensing method using wave function collapse, achieving enhanced precision without entanglement. The protocol offers improved sensitivity, reaching the Heisenberg limit for quantum measurement.

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Area of Science:

  • Quantum Metrology
  • Quantum Sensing
  • Many-Body Physics

Background:

  • Quantum sensors offer superior precision over classical sensors.
  • Current quantum-enhanced sensitivity relies on superposition, entanglement, or specific system states.
  • Existing methods often require complex initializations like entangled states or critical states.

Purpose of the Study:

  • To introduce a novel approach for quantum-enhanced sensitivity in many-body probes.
  • To achieve enhanced sensing precision without requiring prior entanglement.
  • To utilize quantum measurement and wave function collapse for improved sensitivity.

Main Methods:

  • A protocol involving a sequence of local measurements on a many-body probe.
  • Measurements are performed regularly during the probe's evolution without reinitialization.
  • The approach leverages the inherent nature of quantum measurement and wave function collapse.

Main Results:

  • Sensing precision is enhanced beyond the standard quantum limit.
  • The precision asymptotically approaches the Heisenberg limit with an increasing number of measurement sequences.
  • The protocol demonstrates quantum-enhanced sensitivity without demanding prior entanglement.

Conclusions:

  • A new, entanglement-free protocol enhances quantum sensing precision in many-body systems.
  • The method utilizes local measurements and wave function collapse, simplifying initialization.
  • This approach enables remote quantum sensing and achieves Heisenberg-limited precision.