Kavli Affiliate: Irfan Siddiqi
| First 5 Authors: Senrui Chen, Akel Hashim, Noah Goss, Alireza Seif, Irfan Siddiqi
| Summary:
Noise is a major challenge for building practical quantum computing systems.
Precise characterization of quantum noise is crucial for developing effective
error mitigation and correction schemes. However, state preparation and
measurement (SPAM) errors on many current platforms can introduce large
ambiguity into conventional noise characterization methods. In this work, we
propose a scheme for enhancing quantum noise characterization using additional
energy levels. We first develop a comprehensive theory on the identifiability
of n-qudit SPAM noise given high-quality single-qudit control, showing the
existence of gauge freedoms which can be completely described using subsystem
depolarizing maps. We then show how to use these extra energy levels to reduce
the gauge ambiguity in characterizing both SPAM and gate noise in the qubit
subspace. We experimentally implement these ideas on a superconducting quantum
computing device and demonstrate a qutrit-enabled enhancement in noise
characterization precision.
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