NIST Achieves Breakthrough in Quantum-based RF Signal Synthesis
NIST researchers, in collaboration with the University of Colorado, have achieved a significant breakthrough in radio-frequency (RF) signal synthesis using quantum-based methods. The team has developed a new RF Josephson arbitrary waveform synthesizer (RF-JAWS) that generates microwave-frequency waveforms with ten times higher amplitude compared to previous methods. This advancement demonstrates the potential for improving measurements of high-accuracy RF voltage and power in modern high-speed communications components and instruments.
The RF-JAWS utilizes a circuit cooled to 4 K, composed of an array of 4500 Josephson junctions. This innovative design introduces a new zero-forcing equalization technique, reducing distortion in drive current pulse patterns. The two-tone synthesis allows for simultaneous verification of the voltage source’s correct operation using both time-efficient low-frequency measurement techniques and slower microwave measurements.
The research team, led by Akim A. Babenko, Nathan E. Flowers-Jacobs, Gregor Lasser, Justus A. Brevik, Anna E. Fox, Paul D. Dresselhaus, Zoya Popović, and Samuel P. Benz, has published a paper detailing their advancements in circuit design and signal processing techniques. This breakthrough aligns with NIST’s goal of advancing quantum-based standards for radio frequency communications, aiming to eliminate costs and overhead associated with calibration and traceability chain measurements by providing self-calibrated, quantum-based standards and automated measurement capability to communication and instrument manufacturers.
Keywords: Voltage, Superconducting, Josephson
