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This study investigates how optical aberrations in laser wavefronts affect the trapping of levitated particles in vacuum, which are promising platforms for quantum sensors. Researchers used Zernike polynomials to systematically control wavefront structure and found that highly focused, unaberrated beams optimize longitudinal trapping frequencies but compromise transverse frequencies. The work combines experimental measurements with numerical simulations to characterize how wavefront modifications impact trap quality for optically levitated particles.
Why it matters
This research provides practical guidance for optimizing optical traps used in quantum sensing applications and fundamental quantum mechanics experiments. Better control of trapping potentials can reduce optical backaction and thermal decoherence, improving the performance of levitated particle-based inertial sensors and other precision measurement devices.
arXiv:2510.17654v2 Announce Type: replace
Abstract: Optically levitated particles have great potential to form the basis of novel quantum- enhanced sensors. These systems are very well suited for inertial sensing, as the particles are isolated from the environment when they are levitated at low pressures. However, there are many challenges in the experimental realization that may affect the performance of these systems. For example, optical aberrations in the wavefront of the trapping laser which arise from optical elements or misalignment have a great impact on the trapping potential. The detrimental effect of optical aberrations has not been thoroughly studied, and usually they are iteratively corrected, giving some conflicting results depending on the figures of merit that are used. In this work, we present a thorough study of the effects of structuring the wavefront of the trapping beams. We observe that clean beams, i.e. highly focused beams with unaberrated wavefronts, may be used to optimize the longitudinal frequencies, at the cost of the transversal ones. Our work is based in a combination of experimental studies using a complete basis of orthogonal polynomials (Zernike polynomials) to control the wavefront and a set of numerical calculations, which allow us to compare the impact of structured wavefronts on the quality of traps for optically levitated particles in vacuum. This will have direct applications in quantum sensing and fundamental studies of quantum mechanics, as it allows the reduction of optical backaction and thermal decoherence of the particles.
Source: Controlling the centre of mass motion of levitated particles using structured wavefronts