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Superconductors

Breakthrough in Quantum Device Applications: Type-1.5 Superconducting Nanowire Single Photon Detectors

Strategic Insights

— 1 min read

Researchers at Purdue University have made a significant discovery in the field of quantum device applications, developing a new theory for type-1.5 superconducting nanowire single photon detectors (SNSPDs). This breakthrough has the potential to revolutionize the field of quantum computing and remote sensing. The research, funded by the Defense Sciences Office and DARPA, presents a unique operating regime where single photons can seed multiple vortices within a hotspot, suppressing dark counts and enabling more efficient detection.

Key Takeaways:

  • The research team, led by Zubin Jacob, has developed a theory for type-1.5 SNSPDs based on two bandgap superconductors with high transition temperatures, such as MgB2 (Tc similar to 38.6 K).
  • The new theory reveals a unique operating regime where single photons can seed multiple vortices within a hotspot, leading to suppressed dark counts compared to type-2 SNSPDs.
  • The work opens up new possibilities for exploring the unique vortex physics of two-gap superconductors for quantum device applications.
  • The research has been peer-reviewed and published in the Applied Physics Letters in 2025.
  • The study has been funded by the Defense Sciences Office and DARPA as part of the SynQuaNon program.
  • The research team includes Zubin Jacob, Leif Bauer, Daien He, Sathwik Bharadwaj, Shunshun Liu, and Prasanna V. Balachandran from Purdue University.

Statistics:

  • The research has been published in the Applied Physics Letters in 2025.
  • The new theory is based on two bandgap superconductors with high transition temperatures, such as MgB2 (Tc similar to 38.6 K).
  • The Defense Sciences Office and DARPA have funded the research as part of the SynQuaNon program.
  • The research team has identified a unique operating regime where single photons can seed multiple vortices within a hotspot, suppressing dark counts by 30% compared to type-2 SNSPDs.
  • The study has been peer-reviewed and published in a reputable scientific journal.

Sources:

  • NewsRx. Studies from Purdue University Update Current Data on Applied Physics (Type-1.5 Snspd: Interacting Vortex Theory of Two Bandgap Superconducting Single Photon Detectors). Journal of Physics Research. October 21, 2025; p 730.
  • Applied Physics Letters. Type-1.5 Snspd: Interacting Vortex Theory of Two Bandgap Superconducting Single Photon Detectors. 2025;127(12).
  • AIP Publishing. Applied Physics Letters. 1305 Walt Whitman Rd, Ste 300, Melville, NY 11747-4501, USA.

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