Unconditional quantum-noise suppression via measurement-based quantum feedback

Abstract

We demonstrate unconditional quantum-noise suppression in a collective spin system via feedback control based on quantum non-demolition measurement (QNDM). We perform shot-noise limited collective spin measurements on an ensemble of $3.7\times 10^5$ laser-cooled 171Yb atoms in their spin-1/2 ground states. Correlation between two sequential QNDMs indicates $-0.80_{-0.12}^{+0.11}\mathrm{dB}$ quantum noise suppression in a conditional manner. Our feedback control successfully converts the conditional quantum-noise suppression into the unconditional one without significant loss of the noise

10 pages, 8 figures, 1 table

References in corpus (25)

• Quantum metrology
• Optical Magnetometry
• Quantum interface between light and atomic ensembles
• Experimental long-lived entanglement of two macroscopic objects
• On the Improvement of Frequency Stardards with Quantum Entanglement
• Information heat engine: converting information to energy by feedback control
• Quantum teleportation between light and matter
• Experimental demonstration of quantum memory for light
• Real-time quantum feedback prepares and stabilizes photon number states
• Implementation of Cavity Squeezing of a Collective Atomic Spin
• Second Law of Thermodynamics with Discrete Quantum Feedback Control
• Mesoscopic atomic entanglement for precision measurements beyond the standard quantum limit
• Quantum feedback control and classical control theory
• States of an Ensemble of Two-Level Atoms with Reduced Quantum Uncertainty
• Magnetic sensitivity beyond the projection noise limit by spin squeezing
• Quantum communication between atomic ensembles using coherent light
• A quantum-mechanical Maxwell's demon
• All-optical versus electro-optical quantum-limited feedback
• Squeezing the Collective Spin of a Dilute Atomic Ensemble by Cavity Feedback
• Conditional Spin-Squeezing of a Large Ensemble via the Vacuum Rabi Splitting
• Spin squeezing of a cold atomic ensemble with the nuclear spin of one-half
• Spin squeezing via quantum feedback
• Quantum State Protection in Cavities
• Strongly Enhanced Spin Squeezing via Quantum Control
• Manipulation of Non-classical Atomic Spin States

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