Deterministic Quantum Communication Between Fixed-Frequency Superconducting Qubits via Broadband Resonators

• URL: http://arxiv.org/abs/2512.08328v1
• Date: Tue, 09 Dec 2025 07:48:03 GMT
• Title: Deterministic Quantum Communication Between Fixed-Frequency Superconducting Qubits via Broadband Resonators
• Authors: Takeaki Miyamura, Zhiling Wang, Kohei Matsuura, Yoshiki Sunada, Keika Sunada, Kenshi Yuki, Jesper Ilves, Yasunobu Nakamura,
• Abstract summary: Quantum communication between remote chips is essential for realizing large-scale superconducting quantum computers.<n>We demonstrate deterministic quantum state transfer and remote entanglement generation between fixed-frequency superconducting qubits on separate chips.<n>We implement broadband transfer resonators composed of two coupled coplanar-waveguide resonators, achieving a bandwidth of more than 100 MHz.
• Score: 7.0825911951696625
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum communication between remote chips is essential for realizing large-scale superconducting quantum computers. For such communication, itinerant microwave photons propagating through transmission lines offer a promising approach. However, demonstrations to date have relied on frequency-tunable circuit elements to compensate for fabrication-related parameter variations between sender and receiver devices, introducing control complexity and limiting scalability. In this work, we demonstrate deterministic quantum state transfer and remote entanglement generation between fixed-frequency superconducting qubits on separate chips. To compensate for the sender-receiver mismatch, we employ a frequency-tunable photon-generation technique which enables us to adjust the photon frequency without modifying circuit parameters. To enhance the frequency tunability, we implement broadband transfer resonators composed of two coupled coplanar-waveguide resonators, achieving a bandwidth of more than 100 MHz. This broadband design enables successful quantum communication across a 30-MHz range of photon frequencies between the remote qubits. Quantum process tomography reveals state transfer fidelities of around 78% and Bell-state fidelities of around 73% across the full frequency range. Our approach avoids the complexity of the control lines and noise channels, providing a flexible pathway toward scalable quantum networks.

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