Investigations on Dynamical Stability in 3D Quadrupole Ion Traps

Abstract

We firstly discuss classical stability for a dynamical system of two ions levitated in a 3D Radio-Frequency (RF) trap, assimilated with two coupled oscillators. We obtain the solutions of the coupled system of equations that characterizes the associated dynamics. In addition, we supply the modes of oscillation and demonstrate the weak coupling condition is inappropriate in practice, while for collective modes of motion (and strong coupling) only a peak of the mass can be detected. Phase portraits and power spectra are employed to illustrate how the trajectory executes quasiperiodic motion on the surface of torus, namely a Kolmogorov-Arnold-Moser (KAM) torus. In an attempt to better describe dynamical stability of the system, we introduce a model that characterizes dynamical stability and the critical points based on the Hessian matrix approach. The model is then applied to investigate quantum dynamics for many-body systems consisting of identical ions, levitated in 2D and 3D ion traps. Finally, the same model is applied to the case of a combined 3D Quadrupole Ion Trap (QIT) with axial symmetry, for which we obtain the associated Hamilton function. The ion distribution can be described by means of numerical modeling, based on the Hamilton function we assign to the system. The approach we introduce is effective to infer the parameters of distinct types of traps by applying a unitary and coherent method, and especially for identifying equilibrium configurations, of large interest for ion crystals or quantum logic.

References in corpus (8)

• Trapped-Ion Quantum Computing: Progress and Challenges
• Modes of Oscillation in Radiofrequency Paul Traps
• Closed-cycle, low-vibration 4 K cryostat for ion traps and other applications
• A Single Trapped Ion as a Time-Dependent Harmonic Oscillator
• Classical and Quantum Modes of Coupled Mathieu Equations
• Dynamics of an unbalanced two-ion crystal in a Penning trap for application in optical mass spectrometry
• Quantum nonstationary oscillators: Invariants, dynamical algebras and coherent states via point transformations
• Overdamped dynamics of a Brownian particle levitated in a Paul trap

Cited by in corpus (4)

• The physics and applications of strongly coupled plasmas levitated in electrodynamic traps
• Exact solutions for time-dependent non-Hermitian oscillators: classical and quantum pictures
• Quasienergy operators and generalized squeezed states for systems of trapped ions
• Contributions to the study of time dependent oscillators in Paul traps. Semiclassical approach