Phys.org  October 11, 2023 For eventual application in quantum error correction, it is advantageous to realize qubits with structured error models, such as biased Pauli errors or conversion of errors into detectable erasures. An international team of researchers (USA – Princeton University, Yale University, France) demonstrated a new neutral atom qubit using the nuclear spin of a long-lived metastable state in 171Yb. The long coherence time and fast excitation to the Rydberg state allowed one- and two-qubit gates with fidelities of 0.9990(1) and 0.980(1), respectively. A large fraction of all gate errors results in decays out of the qubit subspace […]