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Researchers use a new tool to help improve a key component in commercially produced quantum computing circuits. The team of scientists from the U.S. Department of Energy’s (DOE) Ames National Laboratory in partnership with the Superconducting Quantum Materials and Systems Center (SQMS), a DOE National Quantum Information Science Research Center led by Fermilab, used the terahertz SNOM microscope, originally developed at Ames Lab, to investigate the interface and connectivity of a nano Josephson Junction (JJ). The JJ, a key component in superconducting quantum computers, was fabricated by Rigetti Computing, 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.
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