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

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• Signal tracking beyond the time resolution of an atomic sensor by Kalman filtering
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• Superposition of two-mode squeezed states for quantum information processing and quantum sensing
• Efficient Information Retrieval for Sensing via Continuous Measurement
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• Correlation function of spin noise due to atomic diffusion
• Continuous real-time tracking of a quantum phase below the standard quantum limit
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• State-independent preparation uncertainty relations
• Effects of spin-exchange collisions on the fluctuation spectra of hot alkali-metal vapors
• Parallel detection and spatial mapping of large nuclear spin clusters
• Entanglement and extreme planar spin squeezing
• Magic-wavelength Faraday probe measures spin continuously and without light shifts
• Quantum-enhanced magnetometry at optimal number density
• Entanglement-enhanced phase estimation without prior phase information
• Continuously observing a dynamically decoupled spin-1 quantum gas
• Determining complementary properties with quantum clones
• Squeezed Ground States in a Spin-1 Bose-Einstein Condensate
• Multiparameter quantum sensing and magnetic communications with a hybrid dc and rf optically pumped magnetometer
• State independent uncertainty relations from eigenvalue minimization
• Improving Short-Term Stability in Optical Lattice Clocks by Quantum Nondemolition Measurements
• Einstein-Podolsky-Rosen steering, depth of steering and planar spin squeezing in two-mode Bose-Einstein condensates
• Complete physical characterization of QND measurements via tomography
• Improved absolute clock stability by the joint interrogation of two atomic states
• Implementation and characterization of a controllable dephasing channel based on coupling polarization and spatial degrees of freedom of light
• Quantum-enhanced optical phase-insensitive heterodyne detection beyond 3-dB noise penalty of image band
• Decoherence effects in quantum nondemolition measurement induced entanglement between Bose-Einstein condensates
• Cavity-enhanced polarization rotation measurements for low-disturbance probing of atoms
• Multidimensional spectroscopy of nuclear spin clusters in diamond
• Quantum measurement optimization by decomposition of measurements into extremals
• Improved unitary uncertainty relations
• Quantum spectral analysis by continuous measurement of Landau-Zener transitions
• Error-disturbance uncertainty relations in Faraday measurements
• Quantum Cramer-Rao Precision Limit of Noisy Continuous Sensing
• Squeezed-light enhancement and backaction evasion in a high sensitivity optically pumped magnetometer
• High-Accuracy Temporal Prediction via Experimental Quantum Reservoir Computing in Correlated Spins
• Improving the Q factor of an optical atomic clock using quantum non-demolition measurement
• Superresolving collective quantum measurements
• CDJ-Pontryagin Optimal Control for General Continuously Monitored Quantum Systems
• Quantum backaction effects in sequential measurements