Nonreciprocal quantum information processing with superconducting diodes in circuit quantum electrodynamics

• URL: http://arxiv.org/abs/2511.20758v1
• Date: Tue, 25 Nov 2025 19:00:05 GMT
• Title: Nonreciprocal quantum information processing with superconducting diodes in circuit quantum electrodynamics
• Authors: Nicolas Dirnegger, Prineha Narang, Arpit Arora,
• Abstract summary: Superconducting diodes (SDs) are a coherent nonreciprocal element in circuit quantum electrodynamics.<n>We show that flux bias acts cooperatively with the nonlinear diode response to induce direction-dependent resonance shifts in the transmission spectrum.<n>Our work enables high-fidelity signal routing and entanglement generation in all-to-all connected microwave quantum networks.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Introducing new components and functionalities into quantum devices is critical in advancing state-of-the-art hardware. Here, we propose superconducting diodes (SDs) as a coherent nonreciprocal element in circuit quantum electrodynamics (cQED) architectures. In particular, we use an asymmetric SQUID as an SD controlled with a flux bias. We spectroscopically characterize SD and show that flux bias acts cooperatively with the nonlinear diode response to induce direction-dependent resonance shifts in the transmission spectrum. We use the SD as an elementary component to realize coherent nonreciprocal qubit-qubit coupling. With a minimal two qubit system, we demonstrate a nonreciprocal half-iSWAP gate with tunable Bell-state generation, thereby showcasing the potential of intrinsic nonreciprocity as a tool in coherent control in quantum technologies. Our work enables high-fidelity signal routing and entanglement generation in all-to-all connected microwave quantum networks, where nonreciprocity is embedded at the device level.

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