Pulse Selector System for RQL Fluxon Filtering
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Solution Overview
Problem
Superconducting computing systems face challenges in efficiently converting reciprocal quantum logic (RQL) pulses into single unipolar pulses, as existing technologies lack effective methods to selectively propagate either the fluxon or antifluxon based on bias signals.
Innovation Solution
A pulse selector system utilizing an input Josephson transmission line (JTL) and an escape Josephson junction, controlled by a bias signal, to pass and block fluxon or antifluxon, with a current direction inductor configuring the escape Josephson junction to conduct bias current and trigger the selection of one pulse over the other, thereby propagating a unipolar pulse through an output JTL.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an escape Josephson junction is used to selectively pass fluxon or antifluxon, then pulse selection capability is improved, but device complexity increases
Solution Approach 1:
The escape Josephson junction serves as an intermediary element between the input and output JTLs. It mediates the selection process by being triggered by one polarity of pulse (fluxon or antifluxon) to block that pulse while allowing the opposite polarity pulse to pass through to the output,从而实现脉冲选择功能
Solution Approach 2:
The system changes the operational parameters of the escape Josephson junction by applying a bias current that can be adjusted in magnitude and direction. By controlling the bias current parameter, the junction's critical current threshold is modified, enabling selective triggering and blocking of fluxons or antifluxons based on the desired output polarity
2Measurement precision
If bias current is used to control pulse selection, then selection precision is improved, but energy consumption increases
Solution Approach 1:
The bias current applied to the escape Josephson junction is designed to be partially sufficient - it is set at a level that allows selective triggering by only one type of pulse (fluxon or antifluxon) while remaining below the threshold required to trigger both types. This partial action approach enables precise selection without requiring excessive current that would consume more energy
Solution Approach 2:
The system optimizes energy consumption by dynamically adjusting the bias current parameter. The bias current is set to a specific value that creates an asymmetric triggering condition, where the junction responds to only one polarity of input pulse. This parameter optimization allows precise pulse selection while minimizing the energy required to maintain the bias condition
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively converts RQL pulses into unipolar pulses, allowing for selective propagation of either fluxon or antifluxon as a single unipolar pulse, enhancing data processing in superconducting logic gates and circuits by utilizing bias signals for polarity selection.
Implementation Method 1
an escape Josephson junction coupled to an output of the input JTL. The escape Josephson junction can be configured to pass a selected one of the fluxon and the antifluxon of the RQL pulse and to trigger in response to the other of the fluxon and the antifluxon of the RQL pulse to block the other of the fluxon and the antifluxon
Implementation Method 2
a current direction inductor coupled to the escape Josephson junction and an output of the input JTL. The current direction inductor can be configured to conduct bias current from the escape Josephson junction to select the fluxon and to trigger the escape Josephson junction to block the antifluxon
Implementation Method 3
a Josephson transmission line (JTL) can propagate pulsed data by sequential triggering of Josephson junctions
Data Source
AI summary
One example includes a pulse selector system. The pulse selector system includes an input Josephson transmission line (JTL) configured to propagate an input reciprocal quantum logic (RQL) pulse received at an input based on a bias signal. The RQL pulse includes a fluxon and an antifluxon. The system also includes an escape Josephson junction coupled to an output of the input JTL. The escape Josephson junction can be configured to pass a selected one of the fluxon and the antifluxon of the RQL pulse and to trigger in response to the other of the fluxon and the antifluxon of the RQL pulse to block the other of the fluxon and the antifluxon of the RQL pulse. The system further includes an output JTL configured to propagate the selected one of the fluxon and the antifluxon as a unipolar pulse to an output based on the bias signal.