Freezing-Induced Interaction Engineering in Fixed-Frequency Transmon Networks
Abstract
Freezing is usually used to suppress unwanted dynamics, but it can also be used to engineer interactions. We introduce freezing-induced interaction engineering, a drive-only control scheme in which a continuously driven auxiliary subsystem remains frozen while its drive-dependent state reshapes the effective Hamiltonian of neighboring degrees of freedom. We apply this idea to fixed-frequency transmon systems using a driven modulator coupled to a pivot transmon with fixed native exchange interactions to neighboring transmons. Changing only the modulator drive frequency controls the dressed resonance condition of the pivot, selectively activating a native interaction or detuning it from all neighbors. Full lab-frame simulations of multilevel transmons demonstrate this switching mechanism and show that it remains effective under finite-time frequency ramps. We further demonstrate the same control mechanism numerically in a four-transmon, two-neighbor setting, where changing only the modulator drive frequency selectively activates either neighboring native interaction or suppresses both. Repeating this local control unit along a fixed-frequency chain gives a scalable architecture for alternating layers of native iSWAP interactions.
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BibTeX
@misc{xie2026freezinginduced,
title = {{Freezing-Induced Interaction Engineering in Fixed-Frequency Transmon Networks}},
author = {Songbo Xie and Jiheng Duan and Sabre Kais},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2605.19114},
eprint = {2605.19114},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.19114},
}
RIS
TY - UNPB
TI - Freezing-Induced Interaction Engineering in Fixed-Frequency Transmon Networks
AU - Songbo Xie
AU - Jiheng Duan
AU - Sabre Kais
PY - 2026
DA - 2026/10/26
PB - arXiv
DO - 10.48550/arxiv.2605.19114
UR - https://arxiv.org/abs/2605.19114
AB - Freezing is usually used to suppress unwanted dynamics, but it can also be used to engineer interactions. We introduce freezing-induced interaction engineering, a drive-only control scheme in which a continuously driven auxiliary subsystem remains frozen while its drive-dependent state reshapes the effective Hamiltonian of neighboring degrees of freedom. We apply this idea to fixed-frequency transmon systems using a driven modulator coupled to a pivot transmon with fixed native exchange interactions to neighboring transmons. Changing only the modulator drive frequency controls the dressed resonance condition of the pivot, selectively activating a native interaction or detuning it from all neighbors. Full lab-frame simulations of multilevel transmons demonstrate this switching mechanism and show that it remains effective under finite-time frequency ramps. We further demonstrate the same control mechanism numerically in a four-transmon, two-neighbor setting, where changing only the modulator drive frequency selectively activates either neighboring native interaction or suppresses both. Repeating this local control unit along a fixed-frequency chain gives a scalable architecture for alternating layers of native iSWAP interactions.
ER -