Work

Single-Flux-Quantum Based Coincidence Circuits Using Nb/AlOx/Nb Josephson Junctions with Critical Current Density of 10 kA/cm2

Year: 2024

Type: article

Abstract: We demonstrated a coincidence circuit based on single flux quantum (SFQ) circuits with high-time accuracy for a two-photon interferometer using superconducting nanostrip photon detectors (SNSPDs). The coincidence circuit was designed to have 3 different time windows of 30 ps, 100 ps, and 200 ps, which can be selectable on demand. Furthermore, each time window can be fine-tuned by changing the applied bias currents. The circuit was fabricated by the AIST high-speed standard process based on Nb/AlOx/Nb junctions with critical current density of 10 kA/cm2. We experimentally evaluated the time window of the coincidence circuit at temperatures below 2.4 K in a 0.1-W Gifford-McMahon (GM) cryocooler.

Source: IEICE Transactions on Electronics

DOI: 10.1587/transele.2024sei0002

Authors: Shigeyuki MIYAJIMA, Hirotaka TERAI, Shigehito MIKI

Institution: National Institute of Information and Communications Technology

Language: English

Topic: Superconducting and THz Device Technology

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: National Institute of Advanced Industrial Science and Technology, Ministry of Education, Culture, Sports, Science and Technology

OpenAlex ID: W4404783641

FWCI:

Cites: 35

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Related to: 10