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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2512.08328 |
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| _version_ | 1866912986119012352 |
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| author | Miyamura, Takeaki Wang, Zhiling Matsuura, Kohei Sunada, Yoshiki Sunada, Keika Yuki, Kenshi Ilves, Jesper Nakamura, Yasunobu |
| author_facet | Miyamura, Takeaki Wang, Zhiling Matsuura, Kohei Sunada, Yoshiki Sunada, Keika Yuki, Kenshi Ilves, Jesper Nakamura, Yasunobu |
| contents | 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 79% 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_08328 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Deterministic Quantum Communication Between Fixed-Frequency Superconducting Qubits via Broadband Resonators Miyamura, Takeaki Wang, Zhiling Matsuura, Kohei Sunada, Yoshiki Sunada, Keika Yuki, Kenshi Ilves, Jesper Nakamura, Yasunobu Quantum Physics 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 79% 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. |
| title | Deterministic Quantum Communication Between Fixed-Frequency Superconducting Qubits via Broadband Resonators |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2512.08328 |