• Watch IonQ’s Quantum World Congress 2025 Keynote On Demand. • Breaking the decoding bottleneck: Fast and accurate software decoding for Quantum LDPC codes At IonQ, our quantum error correction team is laser-focused on the ultimate destination: building a large-scale fault-tolerant quantum computer. • To get there, we needQuantum Error Correction (QEC). • Recall that QEC protects quantum information by forminglogical qubits, spread across many physical qubits, allowing us to detect and correct errors without destroying the calculation. • However, building a fault-tolerant computer isn’t just about having good qubits-it’s about having a “brain” orchestrating the correction, one that is fast enough to fix errors before they build up. • This “brain” is thedecoder.

Article Summaries:

  • IonQ’s quantum‑error‑correction team has released research demonstrating a new Beam Search Decoder that outperforms the industry‑standard BP‑OSD algorithm for Quantum LDPC codes. The decoder, designed to run entirely on standard CPUs, achieves a 17‑fold reduction in logical error rates on Bivariate Bicycle codes-an efficient alternative to the Surface Code-while maintaining the speed required for fault‑tolerant operation. By exploiting the millisecond‑scale gate times of trapped‑ion qubits, IonQ shows that large‑scale decoding can be handled without custom supercomputing hardware, challenging the prevailing belief that such systems need specialized FPGA or ASIC solutions.

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