High-contrast interaction between remote superconducting qubits mediated by multimode cable coupling

Fuente: arXiv
Saved in:
Bibliographic Details
Main Authors: Zhang, Jiajian, Chu, Ji, Niu, Jingjing, Zhong, Youpeng, Yu, Dapeng
Format: Preprint
Published: 2025
Subjects:
Online Access:
Tags: Add Tag
No Tags, Be the first to tag this record!
_version_ 1866916735282577408
author Zhang, Jiajian
Chu, Ji
Niu, Jingjing
Zhong, Youpeng
Yu, Dapeng
author_facet Zhang, Jiajian
Chu, Ji
Niu, Jingjing
Zhong, Youpeng
Yu, Dapeng
contents Superconducting quantum processors offer a promising path towards practical quantum computing. However, building a fault-tolerant quantum computer with millions of superconducting qubits is hindered by wiring density, packaging constraints and fabrication yield. Interconnecting medium-scale processors via low-loss superconducting links provides a promising alternative. Yet, achieving high-fidelity two-qubit gates across such channels remains difficult. Here, we show that a multimode coaxial cable can mediate high-contrast interaction between spatially separated super-conducting qubits. Leveraging interference between cable modes, we can implement high-fidelity controlled-Z and ZZ-free iSWAP gates by simply modulating qubit frequencies. Numerical simulations under realistic coherence and coupling parameters predict fidelities above 99% for both gate schemes. Our approach provides a versatile building block for modular superconducting architectures and facilitates distributed quantum error correction and large-scale fault-tolerant quantum computing.
format Preprint
id arxiv_https___arxiv_org_abs_2505_08606
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle High-contrast interaction between remote superconducting qubits mediated by multimode cable coupling
Zhang, Jiajian
Chu, Ji
Niu, Jingjing
Zhong, Youpeng
Yu, Dapeng
Quantum Physics
Superconducting quantum processors offer a promising path towards practical quantum computing. However, building a fault-tolerant quantum computer with millions of superconducting qubits is hindered by wiring density, packaging constraints and fabrication yield. Interconnecting medium-scale processors via low-loss superconducting links provides a promising alternative. Yet, achieving high-fidelity two-qubit gates across such channels remains difficult. Here, we show that a multimode coaxial cable can mediate high-contrast interaction between spatially separated super-conducting qubits. Leveraging interference between cable modes, we can implement high-fidelity controlled-Z and ZZ-free iSWAP gates by simply modulating qubit frequencies. Numerical simulations under realistic coherence and coupling parameters predict fidelities above 99% for both gate schemes. Our approach provides a versatile building block for modular superconducting architectures and facilitates distributed quantum error correction and large-scale fault-tolerant quantum computing.
title High-contrast interaction between remote superconducting qubits mediated by multimode cable coupling
topic Quantum Physics
url https://arxiv.org/abs/2505.08606