Effects of Josephson Junction Non-idealities on Adiabatic Quantum Flux Parametron Circuits

• URL: http://arxiv.org/abs/2606.17338v1
• Date: Mon, 15 Jun 2026 22:38:18 GMT
• Title: Effects of Josephson Junction Non-idealities on Adiabatic Quantum Flux Parametron Circuits
• Abstract summary: An Adiabatic quantum flux parametron (AQFP) gate is a promising approach to scale up the cryogenic microwave electronics for superconducting qubit multiplexed control.<n>We demonstrate how the non-sinusoidal current-phase relation in Superconductor-Normal metal-Superconductor (SNS) and weak link (WL) junctions affects the speed, delay, and margin of the AQFP gates.
• Score: 0.6157382820537719
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Adiabatic quantum flux parametron (AQFP) gate is a promising approach to scale up the cryogenic microwave electronics for superconducting qubit multiplexed control. However, the performance of these circuits depends on the quality of the Josephson junctions which are ideally superconductor-insulator-superconductor (SIS) type following the ideal sinusoidal relation between current and quantum phase. We demonstrate how the non-sinusoidal current-phase relation in Superconductor-Normal metal-Superconductor (SNS) and weak link (WL) junctions affects the speed, delay, and margin of the AQFP gates. The JJ models are defined in the Keysight ADS simulator using symbolically defined device (SDD) method.

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