Researchers at MIT Achieve 99.998% Single Qubit Gate Fidelity on a Superconducting Qubit
dougfinke2025-01-18T20:23:49-08:00Operations of a Fluxonium Qubit. Credit: Suppressing Counter-Rotating Errors for Fast Single-Qubit Gates with Fluxonium Published on PRX Quantum MIT researchers achieved a record single-qubit fidelity for superconducting based quantum processors of 99.998% using a superconducting qubit called fluxonium. Although ion trapped based qubits have been able to reach this level, this is the highest we have seen for a qubit based upon superconducting technology. The researchers developed two new control techniques to combat errors, particularly counter-rotating errors, which arise when qubits are controlled with electromagnetic waves. The researchers created "commensurate pulses," applying them at precisely timed intervals to make errors [...]