Mesoscopic quantum superpositions in bimodal Bose-Einstein condensates: decoherence and strategies to counteract it

Abstract

We study theoretically the interaction-induced generation of mesoscopic coherent spin state superpositions (small cat states) from an initial coherent spin state in bimodal Bose-Einstein condensates and the subsequent phase revival, including decoherence due to particle losses and fluctuations of the total particle number. In a full multimode description, we propose a preparation procedure of the initial coherent spin state and we study the effect of preexisting thermal fluctuations on the phase revival, and on the spin and orbito-spinorial cat fidelities.

26 pages, 12 figures; published version

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• Leggett-Garg tests of macro-realism for multi-particle systems including double-well Bose-Einstein condensates
• Spin-squeezed atomic crystal
• Mesoscopic quantum superposition states of weakly-coupled matter-wave solitons
• Generating Macroscopic Superpositions with Interacting Bose-Einstein Condensates: Multi-Mode Speed-Ups and Speed Limits
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• Enhancing Sensitivity of an Atom Interferometer to the Heisenberg Limit using Increased Quantum Noise
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• Fundamental limit of phase coherence in two-component Bose-Einstein condensates
• Suppressing nonadiabatic transitions during adiabatic generation of highly entangled states in bosonic Josephson junctions
• Assisted metrology and preparation of macroscopic superpositions with split spin-squeezed states
• Effect of Inter-Well Interactions on Non-Linear Beam Splitters for Matter-Wave Interferometers
• Scaling laws for the sensitivity enhancement of non-Gaussian spin states
• Evolution of entanglement under an Ising-like Hamiltonian with particle losses