Belarusian quantum communication junction box with low loss

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The invention introduces a method for fabricating low-loss niobium Josephson junctions which enhance quantum device performance by using niobium superconductors that are separated by an aluminum oxide barrier and are encapsulated with aluminum layers to prevent chemical. However, progress in Josephson junction-based quantum technologies is facing the ongoi g challenge of minimizing loss channels. This is also true for parametric superconducting devices based on nonlinear Josephson resonators. This approach enables low-temperature spectroscopy measurements without the need for external RF electronics, a crucial step for advancing quantum technologies. Su-perconducting qubits are commonly realized using Al/AlOx/Al Josephson junctions operating in the tunneling regime, where even minor variations in device geometry can lead to substantial performance fluctuations.

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