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Shot-to-shot noise in optical levitation experiments limits quantum state coherence. Electric stray fields and mechanical instabilities are identified as key noise sources, impacting macroscopic quantum state generation.

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Area of Science:

  • Quantum mechanics
  • Optics
  • Nanotechnology

Background:

  • Optically levitated nanoparticles are key for creating macroscopic quantum states.
  • Generating these states involves sequential potential changes.
  • Variations between experiments (shot-to-shot noise) hinder reproducibility.

Purpose of the Study:

  • Investigate how shot-to-shot noise affects nanoparticle coherence length.
  • Analyze noise sources in state-expansion protocols with inverted potentials.
  • Determine experimental needs for improved quantum state generation.

Main Methods:

  • Experimental study of optically levitated nanoparticles.
  • Modeling of state-expansion protocols using dark, inverted electrical potentials.
  • Identification and analysis of noise sources.

Main Results:

  • Shot-to-shot noise significantly limits coherence length.
  • Electric stray fields are a primary noise source.
  • Mechanical instabilities also contribute significantly to fluctuations.

Conclusions:

  • Understanding and mitigating shot-to-shot noise is crucial for generating quantum states.
  • Precise control over electric fields and mechanical stability is required.
  • This research informs future experimental designs for quantum technologies.