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Quantum-Enhanced Metrology for Molecular Symmetry Violation Using Decoherence-Free Subspaces.

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We present a novel method to detect time-reversal symmetry violation in molecules, surpassing standard quantum limits. This technique uses decoherence-free subspaces for enhanced precision in molecular measurements.

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Area of Science:

  • Atomic, Molecular, and Optical (AMO) Physics
  • Quantum Metrology
  • Chemical Physics

Background:

  • Time-reversal symmetry violation is a key area in fundamental physics.
  • Measuring subtle effects in molecules is challenging due to quantum decoherence and noise.
  • Existing methods often require external fields and are sensitive to environmental disturbances.

Purpose of the Study:

  • To develop a novel protocol for measuring time-reversal symmetry violation in molecules.
  • To overcome the standard quantum limit in precision measurements.
  • To enhance robustness against classical noise using decoherence-free subspaces.

Main Methods:

  • Utilizing entangled states within decoherence-free subspaces.
  • Designing entangled states with zero average lab-frame projection of spins and dipoles.
  • Implementing the protocol without requiring an external electric field.

Main Results:

  • The proposed method overcomes the standard quantum limit for measuring time-reversal symmetry violation.
  • The protocol demonstrates reduced sensitivity to classical noise through decoherence-free subspaces.
  • Entangled states exhibit no first-order sensitivity to static electromagnetic fields.

Conclusions:

  • The developed protocol offers a powerful new tool for probing fundamental symmetries in molecules.
  • This method is applicable to trapped neutral or ionic species.
  • The protocol's feasibility is supported by experimentally demonstrated techniques.