Cavity-aided non-demolition measurements for enhanced spin squeezing

ORAL

Abstract

Projection noise sets a maximum resolution for all sensors that use population measurements of unentangled atoms to sense a quantum phase -- the ``Standard Quantum Limit.'' This limitation can be overcome through the use of entangled, ``squeezed'' ensembles of atoms, allowing for potential improvements in sensor performance. We use quantum non-demolition measurements to prepare and directly observe spin-squeezed states with phase resolution 10.2(6)dB below the SQL, with no background subtraction.

*This material is based upon work supported by the National Science Foundation under Grant Number 1125844; NSF PFC, DARPA QuASAR, ARO, NIST, NSF GRF, NDSEG, A*STAR

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Authors

  • Matthew Norcia

    • JILA, University of Colorado at Boulder

  • Justin Bohnet

    • JILA, University of Colorado at Boulder

  • Kevin Cox

    • JILA, University of Colorado at Boulder

  • Joshua Weiner

    • JILA, University of Colorado at Boulder

  • Zilong Chen

    • JILA, University of Colorado at Boulder

  • James Thompson

    • JILA, University of Colorado at Boulder, NIST