Simultaneous tracking of spin angle and amplitude beyond classical limits

Abstract

We show how simultaneous, back-action evading tracking of non-commuting observables can be achieved in a widely-used sensing technology, atomic interferometry. Using high-dynamic-range dynamically-decoupled quantum non-demolition (QND) measurements on a precessing atomic spin ensemble, we track the collective spin angle and amplitude with negligible effects from back action, giving steady-state tracking sensitivity 2.9 dB beyond the standard quantum limit and 7.0 dB beyond Poisson statistics.

12 pages, 7 figures

References in corpus (6)

• Entanglement detection
• Spin squeezing of a cold atomic ensemble with the nuclear spin of one-half
• Evading quantum mechanics
• Generation and detection of a sub-Poissonian atom number distribution in a one-dimensional optical lattice
• State-independent Uncertainty Relations and Entanglement Detection in Noisy Systems
• Trajectories without quantum uncertainties

Cited by in corpus (5)

• Entanglement Certification $-$ From Theory to Experiment
• Squeezing on momentum states for atom interferometry
• Correlation function of spin noise due to atomic diffusion
• Magic-wavelength Faraday probe measures spin continuously and without light shifts
• Continuously observing a dynamically decoupled spin-1 quantum gas