MilestoneError correctionClaimed

Microsoft and Quantinuum entangle 12 logical qubits with error correction

Sep 6, 2024

Microsoft and Quantinuum prepare entangled states on up to 12 logical qubits using a code that protects four qubits in 16 ions. The experiments combine error correction with discarding uncorrectable runs; separate memory tests apply five correction rounds.

Why it matters

The experiments combine protected gates and error correction across several code blocks, moving beyond isolated encoded qubits.

Microsoft · Quantinuum

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Sources (2)

arXiv Demonstration of quantum computation and error correction with a tesseract code
Primary sourceSep 6, 2024

“The tesseract subsystem color code protects four logical qubits in 16 physical qubits, to distance four. Using the tesseract code on Quantinuum's trapped-ion quantum computers, we prepare high-fidelity encoded graph states on up to 12 logical qubits, beneficially combining for the first time fault-tolerant error correction and computation.”
arXiv Demonstration of quantum computation and error correction with a tesseract code
Primary sourceSep 6, 2024

“When an uncorrectable state is detected, our fault-tolerance procedure rejects the trial. This “postselection” means that more trials are needed to collect a given amount of encoded data.”

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