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Quantum-Enhanced Metrology for Molecular Symmetry Violation Using Decoherence-Free Subspaces
Chi Zhang1, Phelan Yu1, Arian Jadbabaie1
1California Institute of Technology, Division of Physics, Mathematics, and Astronomy, Pasadena, California 91125, USA.
Abstract:
We propose a method to measure time-reversal symmetry violation in molecules that overcomes the standard quantum limit while leveraging decoherence-free subspaces to mitigate sensitivity to classical noise. The protocol does not require an external electric field, and the entangled states have no first-order sensitivity to static electromagnetic fields as they involve superpositions with zero average lab-frame projection of spins and dipoles. This protocol can be applied with trapped neutral or ionic species, and can be implemented using methods that have been demonstrated experimentally.
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