Improving qubit coherence using closed-loop feedback.

ABSTRACT: Superconducting qubits are a promising platform for building a larger-scale quantum processor capable of solving otherwise intractable problems. In order for the processor to reach practical viability, the gate errors need to be further suppressed and remain stable for extended periods of time. With recent advances in qubit control, both single- and two-qubit gate fidelities are now in many cases limited by the coherence times of the qubits. Here we experimentally employ closed-loop feedback to stabilize the frequency fluctuations of a superconducting transmon qubit, thereby increasing its coherence time by 26% and reducing the single-qubit error rate from (8.5 ± 2.1) × 10^-4 to (5.9 ± 0.7) × 10^-4. Importantly, the resulting high-fidelity operation remains effective ev

SUBMITTER: Vepsalainen A 

PROVIDER: S-EPMC9001732 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature