Phase-stable voltage bias for Josephson photonics devices

• URL: http://arxiv.org/abs/2609.17165v1
• Date: Tue, 15 Sep 2026 13:31:29 GMT
• Title: Phase-stable voltage bias for Josephson photonics devices
• Abstract summary: Parametric interactions are foundational to superconducting quantum technologies.<n> Microwave-driven pumping introduces parasitic Kerr nonlinearities and higher-order harmonics that limit device performance.<n>Josephson Photonics avoids these parasitics by utilizing dc-biased junctions.
• Score: 58.079925240809644
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Parametric interactions are foundational to superconducting quantum technologies, yet conventional microwave-driven pumping introduces parasitic Kerr nonlinearities and higher-order harmonics that limit device performance. Josephson Photonics (JP) avoids these parasitics by utilizing dc-biased junctions but has remained constrained by high phase noise and the absence of a stable phase reference. Here, we overcome this limitation by integrating a Josephson voltage standard (JVS) to establish a noise-tolerant phase reference, and demonstrate that this reference is coherently transferred to an inelastic Cooper-pair tunneling amplifier (ICTA) via the superconducting order parameter.The resulting low-phase-noise architecture yields a 14-dB enhancement in averaged gain and better quantum-limited noise performance. Critically, the phase reference enables the first observation of phase-sensitive gain and sqeezing in a dc-biased amplifier. By reconciling clean, Kerr-free nonlinearities with phase-coherent drive, our architecture establishes a robust platform for high-purity parametric processes in superconducting circuits.

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