Amplification of Fluctuations in a Spinor Bose Einstein Condensate

Abstract

Dynamical instabilities due to spin-mixing collisions in a ${}^{87}$Rb F=1 spinor Bose-Einstein condensate are used as an amplifier of quantum spin fluctuations. We demonstrate the spectrum of this amplifier to be tunable, in quantitative agreement with mean-field calculations. We quantify the microscopic spin fluctuations of the initially paramagnetic condensate by applying this amplifier and measuring the resulting macroscopic magnetization. The magnitude of these fluctuations is consistent with predictions of a beyond-mean-field theory. The spinor-condensate-based spin amplifier is thus shown to be nearly quantum-limited at a gain as high as 30 dB.

References in corpus (12)

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• High-Resolution Magnetometry with a Spinor Bose-Einstein Condensate
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• Precision measurement of spin-dependent interaction strengths for spin-1 and spin-2 87Rb atoms
• Quantum quenches in a spinor condensate
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• Vortex quantum creation and winding number scaling in a quenched spinor Bose gas
• Topological defect formation in quenched ferromagnetic Bose-Einstein condensates
• Imaging of spinor gases
• Quantum Noise, Scaling and Domain Formation in a Spinor BEC
• Anisotropic Instabilities in Trapped Spinor Bose-Einstein Condensates

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• Few-body Bose gases in low dimensions -- a laboratory for quantum dynamics
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• Dynamics in spinor condensates controlled by a microwave dressing field
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• Momentum Entanglement for Atom Interferometry
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• A geometrical approach to the dynamics of spinor condensates II: Collective modes
• A geometrical approach to the dynamics of spinor condensates I: Hydrodynamics
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• Spontaneous Magnetic Ordering in a Ferromagnetic Spinor Dipolar Bose-Einstein Condensate
• Mapping the phase diagram of spinor condensates via adiabatic quantum phase transitions
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• System size scaling of topological defect creation in a second-order dynamical quantum phase transition
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• Berezinskii-Kosterlitz-Thouless transition of spin-1 spinor Bose gases in the presence of the quadratic Zeeman effect
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• Three-body Physics in Strongly Correlated Spinor Condensates
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• Floquet Spinor Bose Gases
• Phase-space mixing in dynamically unstable, integrable few-mode quantum systems
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• Many-body effects on second-order phase transitions in spinor Bose-Einstein condensates and breathing dynamics
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• Domain percolation in a quenched ferromagnetic spinor condensate
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• Influence of the particle number on the spin dynamics of ultracold atoms
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