Northrop Grumman had 14 patents in quantum computing during Q4 2023.Northrop Grumman Corp has developed a system using reciprocal quantum logic (RQL) bias-level sensors on an RQL integrated circuit (IC) to sample AC or DC bias values for operational RQL circuitry. The sensors include Josephson transmission lines (JTLs) or logic gates with strengthened or weakened bias taps, allowing for optimization of bias values within the operational range. By staging the strengths of the bias taps in an ensemble of samplers, the system can determine if a provided bias value is an improvement or optimization over a range. GlobalData’s report on Northrop Grumman gives a 360-degreee view of the company including its patenting strategy. Buy the report here.
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Northrop Grumman grant share with quantum computing as a theme is 85% in Q4 2023. Grant share is based on the ratio of number of grants to total number of patents.
Recent Patents
Application: Bias-level sensors for reciprocal quantum logic (Patent ID: US20230363292A1)
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The patent by Northrop Grumman Corp. describes a reciprocal quantum logic (RQL) system that includes an RQL integrated circuit (IC) with operational RQL circuitry and bias-level sensing circuitry. The bias-level sensors, such as Josephson transmission lines (JTLs) or logic gates, are used to sample AC or DC bias values provided to the operational RQL circuitry. By varying the strength of the coupling between the bias signal source and the JTLs or logic gates in the bias-level sensing circuitry, the system can optimize bias values for improved performance. The bias-level sensing circuitry can include an RQL scan register with multiple bias-level sensors coupled in parallel, each with different operating margins, allowing for precise calibration of bias signals.
Furthermore, the patent details a method for calibrating bias signals in the RQL system by inputting sample signals to AC and DC bias sampler wrapper circuitry, observing the outputs, and adjusting the amplitude of clock signals to optimize bias points. The bias-level sensing circuitry can also include a ring oscillator with bias-level sensors coupled in series, providing a comprehensive approach to sensing and calibrating bias levels. Additionally, the bias-level sensors can be phase-specific, driven by specific clock signals, and optimized for different phase differences between clock signals. Overall, the patent outlines a sophisticated system for optimizing bias values in RQL circuits to enhance computational performance.
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