Entanglement-enhanced radio-frequency field detection and waveform sensing

Abstract

We demonstrate a new technique for detecting components of arbitrarily-shaped radio-frequency waveforms based on stroboscopic back-action evading measurements. We combine quantum non-demolition measurements and stroboscopic probing to detect waveform components with magnetic sensitivity beyond the standard quantum limit. Using an ensemble of $1.5\times 10^6$ cold rubidium atoms, we demonstrate entanglement-enhanced sensing of sinusoidal and linearly chirped waveforms, with 1.0(2)dB and 0.8(3)dB metrologically relevant noise reduction, respectively. We achieve volume-adjusted sensitivity of $\delta \mathrm{B}\sqrt{\mathrm{V}}\approx 11.20\mathrm{fT}\sqrt{\mathrm{c}{\mathrm{m}}^3/Hz}$, comparable to the best RF~magnetometers.

References in corpus (22)

• Entanglement detection
• Optical Magnetometry
• Implementation of Cavity Squeezing of a Collective Atomic Spin
• Entanglement and Extreme Spin Squeezing
• Mesoscopic atomic entanglement for precision measurements beyond the standard quantum limit
• States of an Ensemble of Two-Level Atoms with Reduced Quantum Uncertainty
• Magnetic sensitivity beyond the projection noise limit by spin squeezing
• Reduced back-action for phase sensitivity 10 times beyond the standard quantum limit
• Conditional Spin-Squeezing of a Large Ensemble via the Vacuum Rabi Splitting
• Spin squeezing of atomic ensembles via nuclear-electronic spin entanglement
• Spin squeezing of a cold atomic ensemble with the nuclear spin of one-half
• Generation of a squeezed state of an oscillator by stroboscopic back-action-evading measurement
• Simultaneous tracking of spin angle and amplitude beyond classical limits
• Polarization-based Light-Atom Quantum Interface with an All-optical Trap
• Stroboscopic back-action evasion in a dense alkali-metal vapor
• Non-invasive detection of animal nerve impulses with an atomic magnetometer operating near quantum limited sensitivity
• Certified quantum non-demolition measurement of a macroscopic material system
• Real-time vector field tracking with a cold-atom magnetometer
• Quantum atom-light interfaces in the gaussian description for spin-1 systems
• Entangled collective-spin states of atomic ensembles under non-uniform atom-light interaction
• Certified quantum non-demolition measurement of material systems
• Optimal Signal Recovery for Pulsed Balanced Detection

Cited by in corpus (17)

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• Wide-bandwidth atomic magnetometry via instantaneous-phase retrieval
• Noisy atomic magnetometry in real time
• Quantum-enhanced magnetometry at optimal number density
• Multiparameter quantum sensing and magnetic communications with a hybrid dc and rf optically pumped magnetometer
• Generating GHZ states with squeezing and post-selection
• Single-atom transistor as a precise magnetic field sensor
• Scale-invariant spin dynamics and the quantum limits of field sensing
• Cavity-enhanced polarization rotation measurements for low-disturbance probing of atoms
• Experimental quantum-enhanced response function estimation
• Enhancement of nonclassical properties of two-mode squeezed vacuum state with postselected von Neumann measurement
• Optimal estimation of conjugate shifts in position and momentum by classically correlated probes and measurements
• Magnetic-field gradiometer based on ultracold collisions
• Maximizing information obtainable by quantum sensors through the Quantum Zeno Effect
• Transit Noise in Spin Squeezing Experiments with Coated Rubidium Vapor Cell