Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 26: Transport - Poster Session

TT 26.15: Poster

Mittwoch, 29. März 2006, 14:30–18:30, P1

Creating microwave photon pairs in superconducting cavity QED — •Florian Marquardt — Sektion Physik, Arnold Sommerfeld Center for Theoretical Physics, and Center for NanoScience, Ludwig-Maximilians-Universität München, Theresienstr. 37, 80333 München

With the recent advent of superconducting cavity quantum electrodynamics [1], circuit architectures become possible that process and store quantum information in the form of microwave photons traveling along transmission lines on a chip, interacting with superconducting qubits.

In this talk, I will present and theoretically analyze a setup that may be used to create microwave photon pairs with a very high efficiency. The basic mechanism is parametric down conversion, and the necessary nonlinearity is provided by a charge qubit coupled to a cavity. The main advantage of the scheme is achieved by the fact that the qubit acts as an artificial atom whose parameters are fully tunable and can be optimized. Non-idealities such as non-radiative relaxation and dephasing of the qubit are taken into account employing a Lindblad master equation approach.

[1] A. Wallraff et al., Nature 431, 162 (2004).