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Metastable qubits and motional state interferometers in trapped-ion systems

Metastable qubits and motional state interferometers in trapped-ion systems

Monday, February 27, 2023 at 4:00 pm
Weniger 149
Prof. David Allcock (University of Oregon)

While all of the basic primitives required for universal quantum computing (QC) have been demonstrated in trapped-ion qubits with high fidelity, it is currently not possible to simultaneously realize the highest achieved fidelities in a single ion species - typically two species are required. This is a serious impediment to the development of practical quantum computers. However, there is the possibility for achieving high-fidelity, full functionality in a single species: augmentation of an existing species with new functionality via novel encoding schemes in metastable states. I will present recent experimental progress towards implementing this in 40Ca+ ions.

Motional modes of trapped ions have been shown to be a useful tool for quantum sensing as well as a platform for performing continuous variable quantum computing (CVQC). Both applications require the ability to prepare well-defined motional states with high fidelity. Many of these states can be conveniently generated from motional ground states by parametric excitation without the use of laser fields. We generate one- and two-mode squeezing, and beamsplitter operations and use them to create SU(2) and SU(1,1) motional state interferometers.

Refreshments will be offered half an hour before the colloquium in Weniger 379

Oksana Ostroverkhova