Tunable Hybrid-Mode Coupler Enabling Strong Interactions between Transmons at Centimeter-Scale Distance

2025/06/17 by Jianwen Xu, Xu, Jianwen, Xiang Deng +26 · 1 citation
Engineering · #Acoustic Wave Resonator Technologies #FOS: Physical sciences #Microwave Engineering and Waveguides #Quantum Physics (quant-ph)

paper · pdf · doi:10.48550/arxiv.2506.14128

openalex publication_date 2025/06/17 · openalex created_date 2025/10/18 · openalex updated_date 2026/08/03

Abstract

The transmon, a fabrication-friendly superconducting qubit, remains a leading candidate for scalable quantum computing. Recent advances in tunable couplers have accelerated progress toward high-performance quantum processors. However, extending coherent interactions beyond millimeter scales to enhance quantum connectivity presents a critical challenge. Here, we introduce a hybrid-mode coupler exploiting resonator-transmon hybridization to simultaneously engineer the two lowest-frequency mode, enabling high-contrast coupling between centimeter-scale transmons. For a 1-cm coupler, our framework predicts flux-tunable XX and ZZ coupling strengths reaching 23 MHz and 100 MHz, with modulation contrasts exceeding 10² and 10⁴, respectively, demonstrating quantitative agreement with an effective two-channel model. This work provides an efficient pathway to mitigate the inherent connectivity constraints imposed by short-range interactions, enabling transmon-based architectures compatible with hardware-efficient quantum tasks.

Citations

• Demonstration of low-overhead quantum error correction codes
• Parameter optimization for the unimon qubit
• Capacitively Shunted Double-Transmon Coupler Realizing Bias-Free Idling and High-Fidelity CZ Gate
• Scalable Low-overhead Superconducting Non-local Coupler with Exponentially Enhanced Connectivity
• Randomized benchmarking of a high-fidelity remote CNOT gate over a meter-scale microwave interconnect
• Efficient Implementation of Arbitrary Two-Qubit Gates via Unified Control
• Long-Range ZZ Interaction via Resonator-Induced Phase in Superconducting Qubits
• Quantum error correction below the surface code threshold
• A high-efficiency plug-and-play superconducting qubit network
• Distributed quantum computing across an optical network link
• Computational Power of Random Quantum Circuits in Arbitrary Geometries
• Yoked surface codes
• Multimode physics of the unimon circuit
• Dynamically Reconfigurable Photon Exchange in a Superconducting Quantum Processor
• Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router
• Strong Quantum Computational Advantage Using a Superconducting Quantum Processor
• Violating Bell’s inequality with remotely connected superconducting qubits
• Circuit Quantum Electrodynamics

Cited by

• Placing and routing quantum LDPC codes in multilayer superconducting hardware

Related

• Optimizing the frequency positioning of tunable couplers in a circuit QED processor to mitigate spectator effects on quantum operations
• Scalable Fluxonium-Transmon Architecture for Error Corrected Quantum Processors
• Three-mode tunable coupler for superconducting two-qubit gates
• Multiplexed double-transmon coupler scheme in scalable superconducting quantum processor
• Capacitively Shunted Double-Transmon Coupler Realizing Bias-Free Idling and High-Fidelity CZ Gate