While the single-qubit operations are already quite reliable, with a fidelity above 99%, a crucial next step would be to show that the two-qubit gate can also be performed with a fidelity above 99%." ...

The implementation is based on an advanced multi-qubit gate with single-qubit gate fidelities above 99.9% and two-qubit gate fidelities above 99%.

PsiQuantum’s founding team performed the world’s first lab demonstration of a two-qubit logic gate using single photons in Brisbane, Australia over 20 years ago, invented integrated quantum ...