European Center for Quantum Sciences

High-fidelity gates towards error correction with neutral atoms

Researchers at CESQ, Princeton and Yale have achieved the demonstration of high-fidelity one- and two-qubit gates with neutral ytterbium atoms, and of a way to identify when errors occur in quantum computers more easily than ever before. The family of two-qubit gates has been invented by Sven Jandura and Guido Pupillo at the CESQ within the Quantum Flagship project EuRyQa and the MSCA project “MOQS – Molecular quantum simulations”. Qubits are encoded into metastable states of the atoms, which facilitates the detection of errors in mid-circuit measurements and their conversion into erasure errors that are easier to deal with in the context of fault-tolerant quantum computing. The results were published in Nature. These gates have also been realized in a recent experiment with rubidium atoms at Harvard, achieving a record 99.5% fidelity.   READ THE PAPER