High-fidelity qubit operations with 43Ca+
Dr. Norbert Linke (University of Oxford Department of Physics)

Single trapped atomic ions currently represent the most promising and advanced approach towards a quantum computing architecture that can be scaled to many qubits. I will present the implementation of qubits in the ground level of 43Ca+ ions. These have certain advantages such as the availability of pairs of states which are insensitive to magnetic field fluctuations (so-called "clock" states) and hence give coherence times up to 1min - the longest measured in any single physical qubit. Employing microwaves rather than lasers to drive operations is a way to boost the scalability of the approach.
I will give an overview of recent results from experiments conducted at Oxford which include a single-qubit gate performed using near-field microwaves in a surface-electrode trap and a high fidelity two-qubit gate driven with Raman lasers, both of which define the current state of the art. I will then focus on the first results we recently achieved on individual single-qubit addressing with microwaves in a scalable multi-zone surface trap.