Basic cell for a quantum microwave router
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arXiv
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| Format: | Preprint |
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2025
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| author | Mutsenik, Evgeniya Sultanov, Aidar Kaczmarek, Leonie Schmelz, Matthias Oelsner, Gregor Stolz, Ronny Ilichev, Evgeni |
| author_facet | Mutsenik, Evgeniya Sultanov, Aidar Kaczmarek, Leonie Schmelz, Matthias Oelsner, Gregor Stolz, Ronny Ilichev, Evgeni |
| contents | We report the first experimental realization of a scalable basic cell for quantum routing, enabling coherent control and exchange of microwave photons between two spatially separated superconducting waveguides coupled via a single transmon qubit. The cell was characterized at 10 mK with an average input signal of approximately 1 photon at approximately 6 GHz, and with the qubit biased to its optimal point to minimize sensitivity to external magnetic fluctuations. By combining steady-state and time-domain measurements, we reconstructed the key parameters of the system, including qubit relaxation and dephasing, waveguide-qubit couplings, and cross-waveguide photon transfer efficiency. The observed performance is consistent with a non-Hermitian Hamiltonian formalism and demonstrates clear limits set by flux bias, temperature, and photon number, in agreement with flux- and temperature-induced dephasing models. Crucially, the cell operates reliably at the single-photon level, and in the high-photon regime we directly observe photon dressing induced by the qubit. These results establish a versatile platform for studying open quantum system phenomena and pave the way for scalable implementations of quantum routing and network nodes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_17250 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Basic cell for a quantum microwave router Mutsenik, Evgeniya Sultanov, Aidar Kaczmarek, Leonie Schmelz, Matthias Oelsner, Gregor Stolz, Ronny Ilichev, Evgeni Quantum Physics Superconductivity We report the first experimental realization of a scalable basic cell for quantum routing, enabling coherent control and exchange of microwave photons between two spatially separated superconducting waveguides coupled via a single transmon qubit. The cell was characterized at 10 mK with an average input signal of approximately 1 photon at approximately 6 GHz, and with the qubit biased to its optimal point to minimize sensitivity to external magnetic fluctuations. By combining steady-state and time-domain measurements, we reconstructed the key parameters of the system, including qubit relaxation and dephasing, waveguide-qubit couplings, and cross-waveguide photon transfer efficiency. The observed performance is consistent with a non-Hermitian Hamiltonian formalism and demonstrates clear limits set by flux bias, temperature, and photon number, in agreement with flux- and temperature-induced dephasing models. Crucially, the cell operates reliably at the single-photon level, and in the high-photon regime we directly observe photon dressing induced by the qubit. These results establish a versatile platform for studying open quantum system phenomena and pave the way for scalable implementations of quantum routing and network nodes. |
| title | Basic cell for a quantum microwave router |
| topic | Quantum Physics Superconductivity |
| url | https://arxiv.org/abs/2511.17250 |