State Expansion of a Levitated Nanoparticle in a Dark Harmonic Potential

• URL: http://arxiv.org/abs/2312.13111v1
• Date: Wed, 20 Dec 2023 15:30:55 GMT
• Title: State Expansion of a Levitated Nanoparticle in a Dark Harmonic Potential
• Authors: Eric Bonvin and Louisiane Devaud and Massimiliano Rossi and Andrei Militaru and Lorenzo Dania and Dmitry S. Bykov and Oriol Romero-Isart and Tracy E. Northup and Lukas Novotny and Martin Frimmer
• Abstract summary: We spatially expand and subsequently recontract the thermal state of a levitated nanoparticles in vacuum. We achieve state-expansion factors of 25 in standard deviation for a particle initially feedback-cooled to a center-of-mass thermal state.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Levitated nanoparticles in vacuum are prime candidates for generating macroscopic quantum superposition states of massive objects. Most protocols for preparing these states necessitate coherent expansion beyond the scale of the zero-point motion to produce sufficiently delocalized and pure phase-space distributions. Here, we spatially expand and subsequently recontract the thermal state of a levitated nanoparticle by modifying the stiffness of the trap holding the particle. We achieve state-expansion factors of 25 in standard deviation for a particle initially feedback-cooled to a center-of-mass thermal state of \SI{155}{\milli\kelvin}. Our method relies on a hybrid scheme combining an optical trap, for cooling and measuring the particle's motion, with a Paul trap for expanding its state. Consequently, state expansion occurs devoid of measurement backaction from photon recoil, making this approach suitable for coherent wavefunction expansion in future experiments.

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