Berlin 2024 – scientific programme

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QI: Fachverband Quanteninformation

QI 24: Verification and Benchmarking of Quantum Systems

QI 24.8: Talk

Thursday, March 21, 2024, 11:45–12:00, HFT-TA 441

ACES on correlated noise - promises and challenges of frontend noise metrology — •Michael Ronen, Joris Kattemölle, and Guido Burkard — Universität Konstanz, Konstanz, Deutschland

Correlated noise poses a severe challenge to the advantage of many practical quantum algorithms. Error mitigation is indispensable for achieving a quantum advantage with noisy intermediate-scale quantum technology. It relies heavily on our ability to measure and quantify the noise affecting the circuits in quantum computers. Averaged circuit eigenvalue sampling (ACES) promises to be an effective frontend method of noise metrology that can compete with randomized benchmarking and noise tomography. We mark out the capabilities of ACES in measuring spatially and temporally correlated noise. We demonstrate that it can meet expectations when estimating spatially correlated errors but find limits in characterizing their temporally correlated counterparts. These difficulties arise since the error models' complexity grows exponentially with the depth of the circuit while the amount of extractable information stays constant with the number of qubits. By shining a light on ACES' capabilities, we better understand the promises and challenges of frontend noise metrology. Thereby, we point to future lines of inquiry that will improve the accuracy of correlated error model estimation. This will ultimately move us closer to achieving a practical quantum advantage.

Keywords: Quantum Error Correction; Noise Metrology; Correlated Noise; Noisy Circuits; Frontend Quantum Algorithms