{"oa":1,"publisher":"AIP Publishing","OA_type":"green","article_type":"original","citation":{"ista":"Patel L, Hawaldar S, Panikkar A, Shankar A, Suri B. 2025. Impedance-engineered Josephson parametric amplifier with single-step lithography. Applied Physics Letters. 127(25), 254001.","ama":"Patel L, Hawaldar S, Panikkar A, Shankar A, Suri B. Impedance-engineered Josephson parametric amplifier with single-step lithography. <i>Applied Physics Letters</i>. 2025;127(25). doi:<a href=\"https://doi.org/10.1063/5.0290636\">10.1063/5.0290636</a>","ieee":"L. Patel, S. Hawaldar, A. Panikkar, A. Shankar, and B. Suri, “Impedance-engineered Josephson parametric amplifier with single-step lithography,” <i>Applied Physics Letters</i>, vol. 127, no. 25. AIP Publishing, 2025.","chicago":"Patel, Lipi, Samarth Hawaldar, Aditya Panikkar, Athreya Shankar, and Baladitya Suri. “Impedance-Engineered Josephson Parametric Amplifier with Single-Step Lithography.” <i>Applied Physics Letters</i>. AIP Publishing, 2025. <a href=\"https://doi.org/10.1063/5.0290636\">https://doi.org/10.1063/5.0290636</a>.","short":"L. Patel, S. Hawaldar, A. Panikkar, A. Shankar, B. Suri, Applied Physics Letters 127 (2025).","apa":"Patel, L., Hawaldar, S., Panikkar, A., Shankar, A., &#38; Suri, B. (2025). Impedance-engineered Josephson parametric amplifier with single-step lithography. <i>Applied Physics Letters</i>. AIP Publishing. <a href=\"https://doi.org/10.1063/5.0290636\">https://doi.org/10.1063/5.0290636</a>","mla":"Patel, Lipi, et al. “Impedance-Engineered Josephson Parametric Amplifier with Single-Step Lithography.” <i>Applied Physics Letters</i>, vol. 127, no. 25, 254001, AIP Publishing, 2025, doi:<a href=\"https://doi.org/10.1063/5.0290636\">10.1063/5.0290636</a>."},"main_file_link":[{"url":"https://doi.org/10.48550/arXiv.2507.09298","open_access":"1"}],"article_processing_charge":"No","publication":"Applied Physics Letters","year":"2025","acknowledgement":"The authors acknowledge receiving support from the Space Technology Cell at IISc and ISRO through the project STC-0444(2022) and the Ministry of Electronics and Information Technology of the Government of India, under the centre of Excellence of Quantum Technology at the Indian Institute of Science, as well as the office of Principle Scientific Advisor, Government of India. S.H. and A.P. acknowledge the support of the Kishore Vaigyanik Protsahan Yojana (KVPY). A.S. acknowledges the support of a New Faculty Initiation Grant (NFIG) from IIT Madras.","title":"Impedance-engineered Josephson parametric amplifier with single-step lithography","issue":"25","publication_identifier":{"issn":["0003-6951"],"eissn":["1077-3118"]},"_id":"20976","abstract":[{"text":"We present an experimental demonstration of an impedance-engineered Josephson parametric amplifier (IEJPA) fabricated in a single-step lithography process. Impedance-engineering is implemented using a lumped-element series LC circuit. We use a simpler lithography process where the entire device—impedance transformer and Josephson parametric amplifier (JPA)—is patterned in a single electron beam lithography step, followed by a double-angle Dolan-bridge technique for Al–AlOx–Al deposition. We observe amplification with 18 dB gain over a wide 400 MHz bandwidth centered around 5.3 GHz with added noise approaching the quantum limit, and a saturation power of −114 dBm. To accurately explain our experimental results, we extend existing theories for IEJPAs to incorporate the full sine nonlinearity of both the JPA and the transformer. Our work provides a route to simpler realization of broadband JPAs and a theoretical foundation for a regime of JPA operation that has been less explored in literature.","lang":"eng"}],"author":[{"last_name":"Patel","first_name":"Lipi","full_name":"Patel, Lipi"},{"first_name":"Samarth","full_name":"Hawaldar, Samarth","orcid":"0000-0002-1965-4309","last_name":"Hawaldar","id":"221708e1-1ff6-11ee-9fa6-85146607433e"},{"full_name":"Panikkar, Aditya","first_name":"Aditya","last_name":"Panikkar"},{"first_name":"Athreya","full_name":"Shankar, Athreya","last_name":"Shankar"},{"full_name":"Suri, Baladitya","first_name":"Baladitya","last_name":"Suri"}],"volume":127,"type":"journal_article","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","OA_place":"repository","article_number":"254001","oa_version":"Preprint","doi":"10.1063/5.0290636","external_id":{"arxiv":["2507.09298"]},"month":"12","scopus_import":"1","intvolume":"       127","quality_controlled":"1","language":[{"iso":"eng"}],"department":[{"_id":"JoFi"}],"date_created":"2026-01-11T23:01:34Z","day":"22","date_published":"2025-12-22T00:00:00Z","arxiv":1,"date_updated":"2026-01-12T09:57:53Z","publication_status":"published","status":"public"}