Scientists utilized the terahertz SNOM microscope to detect flaws in quantum computing circuits, specifically in the nano Josephson Junction. Addressing these defects is essential for optimizing quantum computing's faster processing capabilities. Researchers used a new tool to help improve a key
Visualization of the microscope tip exposing material to terahertz light. The colors on the material represent the light-scattering data, and the red and blue lines represent the terahertz waves. Credit: U. S. Department of Energy Ames National Labcircuits, specifically in the nano Josephson Junction. Addressing these defects is essential for optimizing quantum computing’s faster processing capabilities.
, originally developed at Ames Lab, to investigate the interface and connectivity of a nano Josephson Junction ., an SQMS partner. The JJ effectively generates a two-level system at very low cryogenic temperature that produces a quantum bit. The images they obtained with the terahertz microscope revealed a defective boundary in the nano junction that causes a disruption in the conductivity and serves as a challenge to produce long coherence times needed for the quantum computation.
Better qubits in a quantum computer lie in understanding the function of a nano Josephson Junction , the component the team examined. Jigang Wang, a scientist from Ames Lab and leader of the research team, explained that this JJ facilitates the supercurrent flow through the circuit at cryogenic temperature, which makes it possible for qubits to exist in their quantum state. It is important that this flow remain uniform and non-dissipative to keep the system coherent.
Wang explained that this finding was important for two reasons. First, it identified an issue with the JJ fabrication, which Rigetti can now resolve thus improving their quantum circuit quality. Secondly, it proves that the terahertz microscope developed at Ames Lab is a useful tool for high throughput screening of quantum circuit components.
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