A new trick brings stability to quantum operations

Researchers at ETH Zurich have developed a highly stable quantum swap gate using geometric phases with neutral atom qubits. Unlike previous approaches relying on dynamical phases from tunneling or collisions, this geometric phase-based gate is largely independent of laser intensity fluctuations and experimental noise. The swap gate achieves 99.91% precision and can be applied simultaneously to 17,000 qubit pairs in under a millisecond. The team used ultracold potassium fermions in optical lattices, exploiting the Pauli exclusion principle to generate the geometric phase. Next steps include combining the swap gates with a quantum gas microscope for selective qubit manipulation, and the researchers have already demonstrated 'half'-swap gates that produce quantum entanglement needed for quantum algorithms.