Quantinuum Implements High-Rate Iceberg Codes on Helios Processor
Mohamed Abdel-Kareem2026-03-14T04:41:07-07:00Iceberg codes and their concatenation Quantinuum implemented high-rate quantum error correcting (QEC) codes on the 98-qubit Helios trapped-ion processor, utilizing the $[[k+2, k, 2]]$ iceberg quantum error detecting (QED) and [[(k2+2)(k1+2), k2k1, 4]] two-level concatenated iceberg QEC codes. This implementation yielded 94 error-detected logical qubits and 48 error-corrected logical qubits from the 98 physical qubits available on the system. The high-rate encoding achieved a physical-to-logical qubit ratio near 2:1 for error correction and approximately 1:1 for error detection, enabled by the all-to-all connectivity inherent in the trapped-ion architecture. The logical qubits demonstrated "beyond break-even" performance, exhibiting error rates 10 to 100 [...]