11
Feb
2025
14:30

Raam Uzdin: "End-to-end quantum error mitigation of dynamic circuits in quantum computers"

11 Feb 2025
14:30
to
15:30
Weekly seminar
|
Solid State Auditorium

Unlike quantum error correction, which involves real-time correction of errors in quantum circuits, quantum error mitigation (QEM) is a family of techniques that utilize multiple variants of the original noisy circuit to eliminate noise in post-processing. Despite their impressive success, QEM protocols often face limitations, such as applicability only to Clifford gates and sensitivity to noise drift. Moreover, these protocols presently do not mitigate mid-circuit measurements, which are a crucial element both in quantum error correction codes and in the design of efficient dynamic circuits. Another significant noise source that existing QEM methods currently do not address is the preparation process of the initial state, i.e. the “reset” of the qubits after each shot. We present an end-to-end mitigation scheme that addresses all these noise sources simultaneously: preparation errors, mid-circuit and terminating measurement errors, and gate errors. Coherent errors, such as those caused by cross-talk between qubits, are also mitigated. Crucially, our method is intrinsically noise-drift resilient, which facilitates extremely long runtimes without calibrating the device. Finally, we emphasize that fault-tolerant quantum error correction, the ultimate goal of quantum computing, is essentially a form of dynamic circuit. Thus, even if error correction is not implemented flawlessly, our end-to-end approach can effectively mitigate the remaining errors. Experimental results from the IBM quantum computers will be presented.