Approaching the Heisenberg Limit without Single-Particle Detection

Emily Davis, Gregory Bentsen, and Monika Schleier-Smith
Phys. Rev. Lett. 116, 053601 – Published 2 February 2016
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Abstract

We propose an approach to quantum phase estimation that can attain precision near the Heisenberg limit without requiring single-particle-resolved state detection. We show that the “one-axis twisting” interaction, well known for generating spin squeezing in atomic ensembles, can also amplify the output signal of an entanglement-enhanced interferometer to facilitate readout. Applying this interaction-based readout to oversqueezed, non-Gaussian states yields a Heisenberg scaling in phase sensitivity, which persists in the presence of detection noise as large as the quantum projection noise of an unentangled ensemble. Even in dissipative implementations—e.g., employing light-mediated interactions in an optical cavity or Rydberg dressing—the method significantly relaxes the detection resolution required for spectroscopy beyond the standard quantum limit.

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  • Received 14 August 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.053601

© 2016 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
General Physics

Authors & Affiliations

Emily Davis, Gregory Bentsen, and Monika Schleier-Smith

  • Department of Physics, Stanford University, Stanford, California 94305, USA

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Issue

Vol. 116, Iss. 5 — 5 February 2016

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