Fast unconditional reset and leakage reduction in fixed-frequency transmon qubits
Abstract
The realization of fault-tolerant quantum computing requires the execution of quantum error-correction (QEC) schemes, to mitigate the fragile nature of qubits. In this context, to ensure the success of QEC, a protocol capable of implementing both qubit reset and leakage reduction is highly desirable. We demonstrate such a protocol in an architecture consisting of fixed-frequency transmon qubits pair-wise coupled via tunable couplers -- an architecture that is compatible with the surface code. We use tunable couplers to transfer any undesired qubit excitation to the readout resonator of the qubit, from which this excitation decays into the feedline. In total, the combination of qubit reset, leakage reduction, and coupler reset takes only 83ns to complete. Our reset scheme is fast, unconditional, and achieves fidelities well above 99%, thus enabling fixed-frequency qubit architectures as future implementations of fault-tolerant quantum computers. Our protocol also provides a means to both reduce QEC cycle runtime and improve algorithmic fidelity on quantum computers.
Cite
@article{arxiv.2409.16748,
title = {Fast unconditional reset and leakage reduction in fixed-frequency transmon qubits},
author = {Liangyu Chen and Simon Pettersson Fors and Zixian Yan and Anaida Ali and Tahereh Abad and Amr Osman and Eleftherios Moschandreou and Benjamin Lienhard and Sandoko Kosen and Hang-Xi Li and Daryoush Shiri and Tong Liu and Stefan Hill and Abdullah-Al Amin and Robert Rehammar and Mamta Dahiya and Andreas Nylander and Marcus Rommel and Anita Fadavi Roudsari and Marco Caputo and Grönberg Leif and Joonas Govenius and Miroslav Dobsicek and Michele Faucci Giannelli and Anton Frisk Kockum and Jonas Bylander and Giovanna Tancredi},
journal= {arXiv preprint arXiv:2409.16748},
year = {2024}
}