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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.9: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

Circuit-QED with left-handed superlattice metamaterials — •Anette Messinger, Bruno Taketani, and Frank K. Wilhelm — Theoretical Physics, Saarland University, 66123 Saarbrücken, Germany

Circuit QED deals with quantum phenomena in superconducting circuits, in which photons can interact with artificial qubits. With new circuit architectures one can reach new optical properties like nonlinear effects and left-handedness with promising applications for quantum computers. Recently, a quantum mechanical phase transition of the qubit's tunneling probability was predicted in a transmission line coupled to a left-handed circuit [1].

In this work, we investigate a superlattice of two alternating left-handed circuit cells instead of a normal left-handed circuit. This gives rise to a new energy band in which the density of modes can reach extremely high values, and with that, strong multimode coupling of the qubit is possible. Furthermore, we use adiabatic renormalization to find the effective tunneling element of the qubit. While in the previously proposed system one phase transition from delocalization of the qubit to quasi-localization was observed, here we will show two additional phases of partial localization appearing.

References:

[1] D. J. Egger and F. K. Wilhelm, Phys. Rev. Lett. 111, 163601 (2013)