At this week’s Quantum World Congress, Microsoft made three announcement on advancements and developments in their quantum program.
The first is continued advancement in its error correction research in partnership with Quantinuum. In April, we reported that this team has created a circuit that creates four logical qubits from 30 physical qubits on Quantinuum’s H2 processor. Now they have implemented a [16,4,4] tesseract code that is more efficient an can encode four logical qubits with only 16 physical qubits. They have leveraged this code to demonstrate three different circuits that implement 4 logical qubits on Quantinuum’s 20 qubit H1 processor and 8 and 12 logical qubits on Quantinuum’s 56 qubit H2 processor. When implementing these codes, they were able to achieve circuit error rate improvements of between 11 to 22 times over a corresponding physical error rate for the circuit.
This demonstration goes farther than some of the other error correction code experiments we have seen because the team was also able to implement five rounds of logic gates with these circuits. Other experiments have shown error correction to create logical qubits, but not subjecting those logical qubits to gate operations. A table that compares the Baseline error rate, the Encoded error rate, and the Gain for each of the three configurations is shown below.
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