Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster: Quantum Optics and Photonics II
Q 31.20: Poster
Tuesday, March 24, 2015, 17:00–19:00, C/Foyer
Quantization of the power divider and applications in circuit QED — •Marius Schöndorf1, Luke Govia1, Bruno Taketani1, Emily Pritchett2, and Frank Wilhelm-Mauch1 — 1Universität des Saarlandes, Saarbrücken — 2HRL Laboratories, Malibu, CA
Superconducting qubits are a promising candidate architecture for quantum computing and quantum information.They work in the microwave regime and therefore microwave devices are required for control and manipulation. In this work one such microwave device, the power divider, is described quantum mechanically using scattering matrix formalism. Application of the scattering matrix to specific input states leads us to an effect similar to the Hong-Ou-Mandel effect, one of the most characteristic effects in quantum optics. Furthermore we address the open question of the strong enhancement in the second order correlation function at low input power, seen in the experiment of Chen et al. [Phys. Rev. Lett. 107, 217401 (2012)]. Our results show, that the enhancement is basically caused by dark counts of the Josephson photomultiplier [Phys. Rev. Lett. 107, 217401 (2012)] used in the experiment. Finally, we present setups for microwave photon counters that combine several Josephson photomultipliers and circulators with power dividers.