QEC demonstrations leveraging dynamic circuits
Talkat Near-Term Quantum Computers: Fault Tolerance + Benchmarking + Quantum Advantage + Quantum Algorithms · 2024-04-22..04-26·
summary
Demonstrates that preparing a logical CZ magic state on a 4,2,2 code with mid-circuit measurement and real-time feedforward yields lower infidelity than the best unencoded 2‑qubit CZ pairs on the same 27‑qubit Falcon R8 chip, claiming beyond break-even fidelity for the encoded input to distillation. The error-suppressed magic state preparation uses seven qubits, logical tomography, and doubles data acceptance versus postselection by using dynamic circuits. Separate d=3 runs on a tunable‑coupler Egret show much reduced two‑qubit error and leakage.
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chapters (11)
- 0:00Introduction to IBM research
- 0:39Understanding dynamic circuits
- 3:11Magic state preparation
- 3:30Error suppressed protocols
- 9:42Logical state verification
- 10:46Experimental performance
- 14:41Error correction review
- 16:18Decoding and hardware updates
- 20:39IBM roadmap and Heron chip
- 24:21Scaling quantum systems
- 26:35Q&A session
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