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QI: Fachverband Quanteninformation

QI 27: Quantum Simulation II

QI 27.2: Talk

Thursday, March 21, 2024, 15:15–15:30, HFT-FT 101

Mitigating crosstalk errors by randomized compiling: simulation of the BCS model on a superconducting quantum computer — •Thibault Scoquart¹, Hugo Perrin¹, Kyrylo Snizkho², Alexander Shnirman¹, and Jörg Schmalian¹ — ¹Karlsruhe Institute of Technology, Institut für Theorie der Kondensierten Materie, TKM, 76049, Karlsruhe, Germany — ²CEA Grenoble, France

In this presentation, I give an overview of our work on 3-qubit simulations of the out-of-equilibrium dynamics of the BCS model, performed on IBMQ quantum computers. In these devices, most errors occur during the application of the 2-qubit CNOT gates. These faulty operations may affect neighboring qubits as well, producing Crosstalk errors, which are believed to be one of the main error source on these devices, and remain challenging to model. As a starting point to mitigate noise, one typically uses Randomized Compiling, a quantum circuit sampling technique which maps unknown noise into a simpler Pauli noise channel. In our work, we have extended this technique to neighboring qubits, and shown that Crosstalk noise can be turned into a simple depolarising noise channel, maximizing the efficiency of existing error mitigation schemes. We illustrate this by combining crosstalk RC with the Noise Estimation Circuit (NEC) error mitigation scheme for our BCS simulations. We show that using crosstalk RC indeed dramatically improves the quality of our results, which can in turn be used as an indirect measure of the impact of crosstalk on a given device.

Preprint: arXiv :2305.02345 (2023)

Keywords: Digital quantum simulation; Quantum error mitigation; Noisy superconducting qubits