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Type-1.5 SNSPD: Interacting vortex theory of two bandgap superconducting single photon detectors

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arxiv 2507.01240 v1 pith:CC7WPGJF submitted 2025-07-01 cond-mat.supr-con cond-mat.mes-hallphysics.ins-det

Type-1.5 SNSPD: Interacting vortex theory of two bandgap superconducting single photon detectors

Leif Bauer , Daien He , Sathwik Bharadwaj , Shunshun Liu , Prasanna V. Balachandran , Zubin Jacob This is my paper
classification cond-mat.supr-con cond-mat.mes-hallphysics.ins-det
keywords detectorsphotonquantumsinglesuperconductorstype-1applicationsbandgap
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Multiple correlation lengths and type-1.5 superconductivity in $U(1)$ superconductors due to hidden competition between irreducible representations of nonlocal pairing

    cond-mat.supr-con 2025-11 conditional novelty 7.0

    A nominally single-component superconductor can exhibit type-1.5 vortex clustering because a suppressed competing pairing channel generates a second coherence length.

  2. Superconducting single-photon detectors for integrated quantum photonics

    physics.optics 2026-05 unverdicted novelty 2.0

    A review summarizing progress in device architectures, material engineering, and integration strategies for superconducting nanowire single-photon detectors in photonic integrated circuits.