Dec 4th: Dr. Archana Kamal (MIT)

Nonreciprocal microwave photonics with superconducting quantum circuits

ROOM 26-214
THURSDAY, Dec 4, 2014
12:00 PM – 13:00 PM

Microwave superconducting circuits, based on Josephson junctions, are coherent quantum systems which are used in a broad spectrum of applications ranging from low-noise parametric amplifiers to qubits. Josephson parametric amplifiers employ the dissipationless nonlinearity provided by the junction to achieve quantum-limited signal processing of microwave photons. I will present recent insights on engineering these parametric systems to steer photons in a directional manner [1]. This can lead to on-chip realizations of nonreciprocity free of magnetic fields, unlike usual ferrite-based nonreciprocal devices such as circulators and isolators, and open doors to qualitative new physics [2].

[1] A. Kamal, J. Clarke, M. H. Devoret, Nature Physics 7, 311 (2011); Phys. Rev. B 86, 144510 (2012)
[2] A. Kamal, A. Roy, J. Clarke, M. H. Devoret, To appear in Phys. Rev. Lett. (2014)

“The IGERT program has been developed to meet the challenges of educating U.S. Ph.D. scientists, engineers, and educators with the interdisciplinary backgrounds, deep knowledge in chosen disciplines, and technical, professional, and personal skills to become in their own careers the leaders and creative agents for change.”

—The National Science Foundation