Publications
List of scientific publications
Non-paraxial effects on laser-qubit interactions
We consider the light potentials induced on an atom by a tightly-focused beam beyond the paraxial approximation. We calculate the light potentials of Gaussian and Laguerre-Gaussian beams driving the quadrupole $^{2}\mathrm{S}_{1/2} \rightarrow\ ^{2}\mathrm{D}_{5/2}$ transition in $^{40}\mathrm{Ca}^+$. Longitudinal field components in the beam center cause spatially-dependent Rabi frequencies and AC Stark shifts which can lead to unexpected qubit-motion coupling.
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Quadratic spin-phonon coupling and bipolarons in trapped ions
We propose a quantum simulation of quadratic spin-phonon coupling in trapped ions using state-dependent optical tweezers, enabling the study of mobile bipolarons driven by zero-point energy and their pinning at finite temperatures.
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Single ion spectroscopy of four metastable state clear-out transitions in Yb II: isotope shifts and hyperfine structure
We present spectroscopic data for four metastable state clear-out transitions between 399 nm and 412 nm for all even long-lived isotopes of $\mathrm{Yb}^+$ as well as their hyperfine structure in $^{171}\mathrm{Yb}^+$.
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Alignment and Optimisation of Optical Tweezers on Trapped Ions
We present a method to align an optical tweezer on a single trapped ion, using the ion to characterize the tweezer. Achieving a smallest waist of $2.3(2)\,\mu$m, we investigate spatial dependence and effects of optical forces, showing scalability to multiple ions with a spatial light modulator.
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Trapped ions quantum logic gate with optical tweezers and the Magnus effect
We propose implementing quantum logic gates in trapped ions using tightly focused optical tweezers, generating qubit-state-dependent forces based on the optical magnus effect. This method, applicable to both ground-state and clock-state qubits, simplifies setup and achieves high fidelity (~0.99988) with minimal errors.
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Trapped Ion Quantum Computing Using Optical Tweezers and Electric Fields
We propose a scalable architecture for trapped ion quantum computing using optical tweezers and oscillating electric fields, enabling long-range interactions without ground-state cooling or the Lamb-Dicke approximation. We address the effects of imperfect cooling and qubit-motion entanglement, and discuss experimental implementation prospects.
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Engineering spin-spin interactions with optical tweezers in trapped ions
We propose using optical tweezers to engineer programmable interactions in trapped-ion quantum simulators, enabling tunable interactions and connectivity beyond current power-law limitations. This method, feasible with realistic settings, advances quantum simulation by creating diverse spin-spin interaction patterns in one- and two-dimensional ion crystals.
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High-fidelity method for a single-step 𝑁-bit Toffoli gate in trapped ions
We propose a high-fidelity (>99%) method for implementing multiqubit Toffoli gates in trapped ions using adiabatic switching of phonon-mediated Ising interactions, achieving gate times below 1 ms with ground-state cooling. Our approach addresses undesired qubit-motion entanglement and requires laser intensity stabilization.
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Experimental setup for studying an ultracold mixture of trapped $\mathrm{Yb}^+-\ ^6\mathrm{Li}$
We detail an experimental setup for studying ultracold lithium atoms and ytterbium ions, including preparation and overlap in a Paul trap. We measure the ion's kinetic energy post-interaction and find that electric-field noise and excess micromotion limit cooling, which can be mitigated by increasing Li gas density.
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Buffer gas cooling of a trapped ion to the quantum regime
We report buffer gas cooling of a trapped ytterbium ion in an ultracold lithium gas, achieving collision energies as low as 9.9 μK. This enables the study of quantum effects in ion-atom collisions and opens opportunities for exploring ion-atom Feshbach resonances.
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