High fidelity quantum computing in 43Ca+
The big challenge for quantum computing is performing high-fidelity operations on a scalable number of well-controlled qubits. Trapped ions are a promising candidate system in this context. Implementing a qubit in the hyperfine-split ground level of 43Ca+ has particular advantages such as the availability of pairs of states which are magnetic field insensitive to first order (so-called "clock" states) and hence give long coherence times (up to 1min). I will present recent results from experiments with 43Ca+ in the Oxford ion trap group which include a high fidelity two-qubit gate driven with Raman lasers and a single-qubit gate performed using near-field microwaves in a surface-electrode trap. I will also discuss our current effort towards individual single-qubit addressing with microwaves in a scalable multi-zone surface trap.
Host: Chris Monroe; Bill Philips