Related papers: Basic cell for a quantum microwave router

Basic cell for a quantum microwave router

URL: http://arxiv.org/abs/2511.17250v1
Date: Fri, 21 Nov 2025 13:54:03 GMT
Title: Basic cell for a quantum microwave router
Authors: Evgeniya Mutsenik, Aidar Sultanov, Leonie Kaczmarek, Matthias Schmelz, Gregor Oelsner, Ronny Stolz, Evgeni Ilichev,
Abstract summary: We report the first experimental realization of a scalable basic cell for quantum routing.<n>The cell operates reliably at the single-photon level, and in the high-photon regime we directly observe photon dressing induced by the qubit.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: 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.

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