Spin Qubits in Photon-Coupled Microwave Cavities

• URL: http://arxiv.org/abs/2608.06859v1
• Date: Fri, 07 Aug 2026 06:37:27 GMT
• Title: Spin Qubits in Photon-Coupled Microwave Cavities
• Abstract summary: Electron spin qubits in microwave cavities provide a promising platform for scalable quantum computing hardware.<n>We analyze a modular architecture where individual cavities containing a limited number of qubits are coupled via single-photon-exchange waveguides.<n>We map out the distinct physical regimes accessible by tuning key system parameters, offering a viable pathway for scalable cavity-based quantum spin qubit networks.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Electron spin qubits in microwave cavities provide a promising platform for scalable quantum computing hardware, leveraging long coherence times, charge-noise robustness and cavity mediated qubit-qubit interactions. While the strong spin-photon coupling regime is accessible via on-chip micromagnets, scaling conventional architectures by placing multiple qubits within a single shared resonator degrades transmission amplitudes, hence limiting large-scale efficiency. To overcome this limitation, we analyze a modular architecture where individual cavities containing a limited number of qubits are coupled via single-photon-exchange waveguides. Using input/output theory, we compute the transmission amplitudes for networks of two and three coupled cavities in various configurations. We map out the distinct physical regimes accessible by tuning key system parameters, offering a viable pathway for scalable cavity-based quantum spin qubit networks.

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