High-fidelity quantum logic gates using trapped-ion hyperfine qubits
Physical Review Letters American Physical Society 117:6 (2016) 060504
Abstract:
We demonstrate laser-driven two-qubit and single-qubit logic gates with fidelities 99.9(1)% and 99.9934(3)% respectively, significantly above the ≈ 99% minimum threshold level required for faulttolerant quantum computation, using qubits stored in hyperfine ground states of calcium-43 ions held in a room-temperature trap. We study the speed/fidelity trade-off for the two-qubit gate, for gate times between 3.8 μs and 520 μs, and develop a theoretical error model which is consistent with the data and which allows us to identify the principal technical sources of infidelity.Dark-resonance Doppler cooling and high fluorescence in trapped Ca-43 ions at intermediate magnetic field
New Journal of Physics IOP Publishing 18:2 (2016) 023043
High-fidelity spatial and polarization addressing of Ca-43 qubits using near-field microwave control
(2016)
High-fidelity quantum logic gates using trapped-ion hyperfine qubits
(2015)
Hybrid quantum logic and a test of Bell’s inequality using two different atomic isotopes
Nature Springer Nature 528:7582 (2015) 384-386