Zobrazeno 1 - 10
of 328
pro vyhledávání: '"P Kopas"'
Autor:
Kopas, Cameron J., Goronzy, Dominic P., Pham, Thang, Castanedo, Carlos G. Torres, Cheng, Matthew, Cochrane, Rory, Nast, Patrick, Lachman, Ella, Zhelev, Nikolay Z., Vallieres, Andre, Murthy, Akshay A., Oh, Jin-su, Zhou, Lin, Kramer, Matthew J., Cansizoglu, Hilal, Bedzyk, Michael J., Dravid, Vinayak P., Romanenko, Alexander, Grassellino, Anna, Mutus, Josh Y., Hersam, Mark C., Yadavalli, Kameshwar
The performance of superconducting qubits is often limited by dissipation and two-level systems (TLS) losses. The dominant sources of these losses are believed to originate from amorphous materials and defects at interfaces and surfaces, likely as a
Externí odkaz:
http://arxiv.org/abs/2408.02863
Autor:
Wang, Xiqiao, Howard, Joel, Sete, Eyob A., Stiehl, Greg, Kopas, Cameron, Poletto, Stefano, Wu, Xian, Field, Mark, Sharac, Nicholas, Eckberg, Christopher, Cansizoglu, Hilal, Katta, Raja, Mutus, Josh, Bestwick, Andrew, Yadavalli, Kameshwar, Pappas, David P.
Superconducting quantum processors are one of the leading platforms for realizing scalable fault-tolerant quantum computation (FTQC). The recent demonstration of post-fabrication tuning of Josephson junctions using alternating-bias assisted annealing
Externí odkaz:
http://arxiv.org/abs/2407.06425
Autor:
Wisne, Maxwell, Deng, Yanpei, Cansizoglu, Hilal, Kopas, Cameron, Mutus, Josh, Chandrasekhar, Venkat
Josephson junctions supply the nonlinear inductance element in superconducting qubits. In the widely used transmon configuration, where the junction is shunted by a large capacitor, the low charging energy minimizes the sensitivity of the qubit to ch
Externí odkaz:
http://arxiv.org/abs/2405.19658
Autor:
Torres-Castanedo, Carlos G., Goronzy, Dominic P., Pham, Thang, McFadden, Anthony, Materise, Nicholas, Das, Paul Masih, Cheng, Matthew, Lebedev, Dmitry, Ribet, Stephanie M., Walker, Mitchell J., Garcia-Wetten, David A., Kopas, Cameron J., Marshall, Jayss, Lachman, Ella, Zhelev, Nikolay, Sauls, James A., Mutus, Joshua Y., McRae, Corey Rae H., Dravid, Vinayak P., Bedzyk, Michael J., Hersam, Mark C.
Superconducting Nb thin films have recently attracted significant attention due to their utility for quantum information technologies. In the processing of Nb thin films, fluoride-based chemical etchants are commonly used to remove surface oxides tha
Externí odkaz:
http://arxiv.org/abs/2404.04489
Autor:
Pappas, David P., Field, Mark, Kopas, Cameron, Howard, Joel A., Wang, Xiqiao, Lachman, Ella, Zhou, Lin, Oh, Jinsu, Yadavalli, Kameshwar, Sete, Eyob A., Bestwick, Andrew, Kramer, Matthew J., Mutus, Joshua Y.
Publikováno v:
Communications Materials volume 5, Article number: 150 (2024)
We demonstrate a transformational technique for controllably tuning the electrical properties of fabricated thermally oxidized amorphous aluminum-oxide tunnel junctions. Using conventional test equipment to apply an alternating bias to a heated tunne
Externí odkaz:
http://arxiv.org/abs/2401.07415
Autor:
Bal, Mustafa, Murthy, Akshay A., Zhu, Shaojiang, Crisa, Francesco, You, Xinyuan, Huang, Ziwen, Roy, Tanay, Lee, Jaeyel, van Zanten, David, Pilipenko, Roman, Nekrashevich, Ivan, Lunin, Andrei, Bafia, Daniel, Krasnikova, Yulia, Kopas, Cameron J., Lachman, Ella O., Miller, Duncan, Mutus, Josh Y., Reagor, Matthew J., Cansizoglu, Hilal, Marshall, Jayss, Pappas, David P., Vu, Kim, Yadavalli, Kameshwar, Oh, Jin-Su, Zhou, Lin, Kramer, Matthew J., Lecocq, Florent Q., Goronzy, Dominic P., Torres-Castanedo, Carlos G., Pritchard, Graham, Dravid, Vinayak P., Rondinelli, James M., Bedzyk, Michael J., Hersam, Mark C., Zasadzinski, John, Koch, Jens, Sauls, James A., Romanenko, Alexander, Grassellino, Anna
Publikováno v:
npj Quantum Inf 10, 43 (2024)
We present a novel transmon qubit fabrication technique that yields systematic improvements in T$_1$ relaxation times. We fabricate devices using an encapsulation strategy that involves passivating the surface of niobium and thereby preventing the fo
Externí odkaz:
http://arxiv.org/abs/2304.13257
Autor:
David P. Pappas, Mark Field, Cameron J. Kopas, Joel A. Howard, Xiqiao Wang, Ella Lachman, Jinsu Oh, Lin Zhou, Alysson Gold, Gregory M. Stiehl, Kameshwar Yadavalli, Eyob A. Sete, Andrew Bestwick, Matthew J. Kramer, Josh Y. Mutus
Publikováno v:
Communications Materials, Vol 5, Iss 1, Pp 1-7 (2024)
Abstract Superconducting quantum bits (qubits) rely on ultra-thin, amorphous oxide tunneling barriers that can have significant inhomogeneities and defects as grown. This can result in relatively large uncertainties and deleterious effects in the cir
Externí odkaz:
https://doaj.org/article/d20a8d0740a34eadb18fb448e6af70b0
Autor:
Cardani, L., Colantoni, I., Cruciani, A., De Dominicis, F., D'Imperio, G., Laubenstein, M., Mariani, A., Pagnanini, L., Pirro, S., Tomei, C., Casali, N., Ferroni, F., Frolov, D., Gironi, L., Grassellino, A., Junker, M., Kopas, C., Lachman, E., McRae, C. R. H., Mutus, J., Nastasi, M., Pappas, D. P., Pilipenko, R., Sisti, M., Pettinacci, V., Romanenko, A., Van Zanten, D., Vignati, M., Withrow, J. D., Zhelev, N. Z.
Radioactivity was recently discovered as a source of decoherence and correlated errors for the real-world implementation of superconducting quantum processors. In this work, we measure levels of radioactivity present in a typical laboratory environme
Externí odkaz:
http://arxiv.org/abs/2211.13597
Autor:
Mustafa Bal, Akshay A. Murthy, Shaojiang Zhu, Francesco Crisa, Xinyuan You, Ziwen Huang, Tanay Roy, Jaeyel Lee, David van Zanten, Roman Pilipenko, Ivan Nekrashevich, Andrei Lunin, Daniel Bafia, Yulia Krasnikova, Cameron J. Kopas, Ella O. Lachman, Duncan Miller, Josh Y. Mutus, Matthew J. Reagor, Hilal Cansizoglu, Jayss Marshall, David P. Pappas, Kim Vu, Kameshwar Yadavalli, Jin-Su Oh, Lin Zhou, Matthew J. Kramer, Florent Lecocq, Dominic P. Goronzy, Carlos G. Torres-Castanedo, P. Graham Pritchard, Vinayak P. Dravid, James M. Rondinelli, Michael J. Bedzyk, Mark C. Hersam, John Zasadzinski, Jens Koch, James A. Sauls, Alexander Romanenko, Anna Grassellino
Publikováno v:
npj Quantum Information, Vol 10, Iss 1, Pp 1-8 (2024)
Abstract We present a transmon qubit fabrication technique that yields systematic improvements in T 1 relaxation times. We encapsulate the surface of niobium and prevent the formation of its lossy surface oxide. By maintaining the same superconductin
Externí odkaz:
https://doaj.org/article/e2667e9866cd4486bc13a96591904d6d
Autor:
Tanatar, Makariy A., Torsello, Daniele, Joshi, Kamal R., Ghimire, Sunil, Kopas, Cameron J., Marshall, Jayss, Mutus, Josh Y., Ghigo, Gianluca, Zarea, Mehdi, Sauls, James A., Prozorov, Ruslan
Publikováno v:
Phys. Rev. B 106, 224511 (2022)
Niobium is one of the most studied superconductors, both theoretically and experimentally. It is tremendously important for applications, and it has the highest superconducting transition temperature, $T_{c}=9.33$ K, of all pure metals. In addition t
Externí odkaz:
http://arxiv.org/abs/2207.14395