PreprintarXiv licencearXiv
Two-qubit gates for the soft 0-π qubit
Abstract
The 0-π qubit promises longer lifetimes than the transmon, making it a strong candidate for a next-generation, lower-error qubit. Gyenis et al. experimentally demonstrated an unprotected single-qubit gate in the soft 0-π regime [1], but no corresponding two-qubit gate has yet been proposed. We propose an unprotected CZ gate for capacitively coupled soft 0-π qubits. The gate uses a direct transition between a computational state and a higher non-computational state. Assuming negligible device disorder and a phenomenological noise model, the simulated CZ gate achieves a fidelity of approximately 99.9% at a gate time of approximately 160 ns.
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BibTeX
@misc{liu2026twoqubit,
title = {{Two-qubit gates for the soft 0-π qubit}},
author = {Zhenxing Liu and Eli Weissler and Joshua Combes},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.16630},
eprint = {2609.16630},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.16630},
}
RIS
TY - UNPB
TI - Two-qubit gates for the soft 0-π qubit
AU - Zhenxing Liu
AU - Eli Weissler
AU - Joshua Combes
PY - 2026
DA - 2026/09/15
PB - arXiv
DO - 10.48550/arxiv.2609.16630
UR - https://arxiv.org/abs/2609.16630
AB - The 0-π qubit promises longer lifetimes than the transmon, making it a strong candidate for a next-generation, lower-error qubit. Gyenis et al. experimentally demonstrated an unprotected single-qubit gate in the soft 0-π regime [1], but no corresponding two-qubit gate has yet been proposed. We propose an unprotected CZ gate for capacitively coupled soft 0-π qubits. The gate uses a direct transition between a computational state and a higher non-computational state. Assuming negligible device disorder and a phenomenological noise model, the simulated CZ gate achieves a fidelity of approximately 99.9% at a gate time of approximately 160 ns.
ER -