M. M.

Publications

List of scientific publications

Single ion spectroscopy of four metastable state clear-out transitions in Yb II: isotope shifts and hyperfine structure

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

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

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

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

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

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 $\mathrm{Yb}^+-\ ^6\mathrm{Li}$

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

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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