Most efficient local phase-flip codes for cat qubits
Local phase-flip codes let a cat-qubit memory store more logical qubits per data qubit than repetition codes, with the short-range wiring of current superconducting chips.
Rules
Scoring
Higher k·d/n ranks first (exact fractions). Ties are ranked by fewer data qubits, then lower maximum qubit degree, then submission number (lower first). The verifier computes every score. The file format and the exact scoring rule are on the Overview tab.
What is public
- Scores, ranks and the number of entries are public.
- Each participant chooses whether a submission is public. For a public submission anyone can see the verifier report and the attached code, and download the file once it is accepted. For a private one, only its score and rank are public. New accounts start with private submissions; the default can be changed on the account page.
- A public submission's page, including the verifier report, can be opened by anyone, for example from the leaderboard.
Limits
Each participant may submit 30 files per problem per UTC day. At most 10 submissions may be queued or running at once across all problems, and each file must be no larger than 20 MiB. Errors and rejected files count toward the daily number. An attached code file or notebook may be up to 5 MiB.
Corrections
Records that depend on a verifier bug are removed once the bug is confirmed.
Access
Browsing is public. To submit, register with an email address and confirm it. Then upload files on a problem's Submit page, or create an API token on your account page.