Type-1.5 SNSPD: Interacting vortex theory of two bandgap superconducting single photon detectors
Abstract
Photon detectors based on type-2 superconductors have found widespread applications from on-chip quantum computing to quantum remote sensing. Here, we develop the theory for a different class of type-1.5 superconducting nanowire single photon detectors (SNSPDs) based on two bandgap superconductors with high transition temperatures such as MgB2 (Tc∼ 38.6 K). We show that vortex–vortex interactions in two component condensates lead to a unique operating regime where single photons can seed multiple vortices within a hotspot. We also show that dark counts are suppressed in the type-1.5 regime compared to the widely studied type-2 SNSPDs. Our work opens the door for exploring the unique vortex physics of two-gap superconductors for quantum device applications.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (6)
Leif Bauer
Elmore Family School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University , West Lafayette, Indiana 47907,
Daien He
The Elmore Family School of Electrical and Computer Engineering, Purdue University 1 , West Lafayette, Indiana 47907,
Sathwik Bharadwaj
The Elmore Family School of Electrical and Computer Engineering, Purdue University 1 , West Lafayette, Indiana 47907,
Shunshun Liu
Prasanna V. Balachandran
Zubin Jacob
Elmore Family School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University , West Lafayette, Indiana 47907,