VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013


 Nanophysics: from fundamentals to applications

(the return)


Thursday 8
Quantum electronics, quantum information, electronic quantum optics, high frequency noise

› 15:50 - 16:10 (20min)
Non-local transport properties of nanoscale conductor-microwave cavity systems
Christian Bergenfeldt  1@  , Peter Samuelsson  1@  
1 : Lund University, Department of Physics
Department of Physics Sölvegatan 14 S-223 62 Lund -  Sweden

Recent experimental progress in coupling nanoscale conductors to superconducting microwave cavities has opened up for transport investigations of the deep quantum limit of light-matter interactions, with tunneling electrons strongly coupled to individual cavity photons. We have investigated theoretically the most basic cavity-conductor system with strong, single photon induced non-local transport effects; two spatially separated double quantum dots (DQD:s) resonantly coupled to the fundamental cavity mode [1]. The system, described by a generalized Tavis-Cummings model, is investigated within a quantum master equation formalism, allowing us to account for both the electronic transport properties through the DQD:s as well as the coherent, non-equilibrium cavity photon state. We find sizeable non-locally induced current and current cross-correlations mediated by individual photons. From a full statistical description of the electron transport we further reveal a dynamical channel blockade in one DQD lifted by photon emission due to tunneling through the other DQD. Moreover, large entanglement between the orbital states of electrons in the two DQD:s is found for small DQD-lead temperatures.

[1] Bergenfeldt, C. and Samuelsson, P., ArXiv preprint arXiv: 1302.5640, 2013.

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