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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Quantum metrology: dynamics versus entanglement.

Sergio Boixo1, Animesh Datta, Matthew J Davis

  • 1Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131-0001, USA.

Physical Review Letters
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces a new quantum measurement protocol. It achieves a 1/n3/2 precision scaling for n constituents without entanglement, potentially applicable to Bose-Einstein condensates.

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Area of Science:

  • Quantum Metrology
  • Quantum Many-Body Systems

Background:

  • Quantum probes utilize multiple constituents to enhance measurement precision.
  • Achieving Heisenberg scaling (1/n) or better typically requires entanglement.

Purpose of the Study:

  • To develop a protocol for measuring a parameter with 1/n3/2 uncertainty.
  • To achieve this precision scaling without generating entanglement among probe constituents.

Main Methods:

  • Devised a protocol involving n constituents interacting via two-body interactions.
  • Focused on measurement schemes that do not necessitate initial or generated entanglement.

Main Results:

  • Demonstrated that the parameter measurement uncertainty scales as 1/n3/2.
  • The protocol achieves this scaling without creating entanglement between constituents.

Conclusions:

  • A protocol exists for sub-Heisenberg limited quantum metrology without entanglement.
  • The proposed method may be implementable in two-component Bose-Einstein condensates.