Type-1.5 SNSPD: Interacting vortex theory of two bandgap superconducting single photon detectors
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916821036171264 |
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| author | Bauer, Leif He, Daien Bharadwaj, Sathwik Liu, Shunshun Balachandran, Prasanna V. Jacob, Zubin |
| author_facet | Bauer, Leif He, Daien Bharadwaj, Sathwik Liu, Shunshun Balachandran, Prasanna V. Jacob, Zubin |
| contents | 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 new class of type-1.5 superconducting nanowire single photon detectors (SNSPDs) based on two bandgap superconductors with high transition temperatures such as MgB2 (Tc ~38.6K). 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_01240 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Type-1.5 SNSPD: Interacting vortex theory of two bandgap superconducting single photon detectors Bauer, Leif He, Daien Bharadwaj, Sathwik Liu, Shunshun Balachandran, Prasanna V. Jacob, Zubin Superconductivity Mesoscale and Nanoscale Physics Instrumentation and Detectors 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 new class of type-1.5 superconducting nanowire single photon detectors (SNSPDs) based on two bandgap superconductors with high transition temperatures such as MgB2 (Tc ~38.6K). 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. |
| title | Type-1.5 SNSPD: Interacting vortex theory of two bandgap superconducting single photon detectors |
| topic | Superconductivity Mesoscale and Nanoscale Physics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2507.01240 |