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 students in MIT’s new NSF training program will be encouraged to cross disciplines, and develop a common fellowship with their peers. We will also address training for post-academic jobs directly by connecting students to government and industrial members of the iQuISE Consortium.”

—Seth Lloyd, Co-Director, iQuISE, and Professor of Mechanical Engineering and Professor of Engineering Systems