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Journal of Physics Conference Series

From Free Motion on a 3-Sphere to the Zernike System of Wavefronts Inside a Circular Pupil

Kurt Bernardo Wolf

Published Apr 1, 2020• 3 citations
Publisher

Abstract

Abstract Classical or quantum systems that stem from a basic symmetry are seen to be special in having several important properties. The harmonic oscillator and the Bohr system are such. Recent research into the Zernike system provides reasons to include it in this privileged class. Here we show that free motion on the 3-sphere can be projected down to produce classical orbits or complete and orthogonal bases for wavefronts in a circular pupil. This line of inquiry has been pursued in company with N.M. Atakishiyev, G.S. Pogosyan, C. Salto-Alegre, and A. Yakhno.

DOI
10.1088/1742-6596/1540/1/012011

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Abstract Classical or quantum systems that stem from a basic symmetry are seen to be special in having several important properties. The harmonic oscillator and the Bohr system are such. Recent research into the Zernike system provides reasons to include it in this privileged class. Here we show that free motion on the 3-sphere can be projected down to produce classical orbits or complete and orthogonal bases for wavefronts in a circular pupil. This line of inquiry has been pursued in company with N.M. Atakishiyev, G.S. Pogosyan, C. Salto-Alegre, and A. Yakhno.
One of the most commonly used quantum mechanical systems is that of the simple harmonic oscillator . The prototype system is the simple pendulum. Classically, the motion of the system exhibits harmonic, or sinusoidal oscillations. The sinusoidal motion of classical mechanics is the simplest system that produces oscillatory behavior, and therefore is found in almost an infinity of physical systems. Thus, the properties of the harmonic oscillator become important for their use in describing quite diverse physical systems. In a solid, the motion of the atoms is much like the motion of free particles, with the important exception that the atoms are forced on average to retain positions within the solid that specify a particular crystal structure. The motion remains that of a harmonic oscillator, but now the shift of the wave function and the energy levels are hybrids of the confinement harmonic oscillator and the magnetic harmonic oscillator.
A unified treatment of quantum mechanical oscillatory motion in one dimension is presented in a phase space formalism which is especially adapted to the semiclassical energy domain and closely related to a `naive' quantization of action and angle variables. Characteristics of this scheme are non-classical symmetry properties of the phase space functions representing density operators and observables and the inclusion of half-Bohr orbits besides the familiar Bohr orbits. Over long time intervals the quantum evolution can be well approximated by a Hamiltonian flow along these distinguished classical orbits. The interplay of this reduced classical evolution and the symmetry properties of the phase space functions results in a consistent quantitative description of quantum interference effects which are most clearly seen in the revivals of wavepackets.
We consider two-dimensional harmonic oscillator in the complex Bargmann-Fock-Segal representation with T∗R2=C2T^*{\mathbb R}^{2}={\mathbb C}^2T∗R2=C2 as classical phase space. We show that the eigenfunctions ψnψ_nψn​ of the quantum Hamiltonian correspond to complex radial coordinates in the reduced phase space C2/Zn⊂C2{\mathbb C}^2/{\mathbb Z}_n\subset{\mathbb C}^2C2/Zn​⊂C2. They describe Zn{\mathbb Z}_nZn​-invariant motion of particle along a circle S1S^1S1 in lens space S3/Zn⊂C2/ZnS^3/{\mathbb Z}_n\subset{\mathbb C}^2/{\mathbb Z}_nS3/Zn​⊂C2/Zn​, where Zn{\mathbb Z}_nZn​ is the cyclic group of rotation by an angle 2π/n2π/n2π/n on the circle S1S^1S1, n=1,2,... n=1,2,...\,n=1,2,.... Thus the general solution of the Schrödinger equation carries information about an infinite number of admissible classical states ψnψ_nψn​ that can be mapped to other states after lifting into the quantum bundle. We show that in the Kepler/hydrogen atom problem there is a similar correspondence between classical and quantum states.
ABSTRACT Optically levitated particles have great potential to form the basis of novel quantum‐enhanced sensors as the particles are isolated from the thermal environment at low pressure. However, the stability and harmonic confinement of these oscillators are always affected by the optical aberrations in the wavefront of the trapping laser. The effect of structured wavefronts on levitated particles has not been thoroughly studied. In this work, we present a theoretical model and experimental confirmation based on a complete basis of orthogonal polynomials (Zernike polynomials) to control and modulating spatial phase of the wavefront of trapping beam, which allows us to compare their impact on the quality of traps for optically levitated particles in vacuum. We observe that there is a trade‐off in the optimization of trapping frequencies. In particular, while Zernicke polynomials can be used to correct aberrations in an optical beam and increase the longitudinal trapping frequencies, this will be detrimental for the transversal ones. This has direct applications in quantum sensing and fundamental studies of quantum mechanics, as we present direct guidelines on how to produce stable levitation for a wide range of particles, while reducing the optical backaction and thermal decoherence of the particles.