Characterising the failure mechanisms of error-corrected quantum logic gates

Understand

Mid-circuit measurements used in quantum error correction are essential in quantum computer architecture, as they read out syndrome data and drive logic gates.

• Here, we use a heavy-hex code prepared on a superconducting qubit array to investigate how different noise sources impact error-corrected logic.
• First, we identify that idling errors occurring during readout periods are highly detrimental to a quantum memory.
• We demonstrate significant improvements to the memory by designing and implementing a low-depth syndrome extraction circuit.