Multi-mode mediated exchange coupling in cavity QED

Autor: Filipp, S., Göppl, M., Fink, J. M., Baur, M., Bianchetti, R., Steffen, L., Wallraff, A.
Rok vydání: 2010
Předmět:
Zdroj: Phys. Rev. A 83, 063827 (2011)
Druh dokumentu: Working Paper
DOI: 10.1103/PhysRevA.83.063827
Popis: Microwave cavities with high quality factors enable coherent coupling of distant quantum systems. Virtual photons lead to a transverse exchange interaction between qubits, when they are non-resonant with the cavity but resonant with each other. We experimentally probe the inverse scaling of the inter-qubit coupling with the detuning from a cavity mode and its proportionality to the qubit-cavity interaction strength. We demonstrate that the enhanced coupling at higher frequencies is mediated by multiple higher-harmonic cavity modes. Moreover, in the case of resonant qubits, the symmetry properties of the system lead to an allowed two-photon transition to the doubly excited qubit state and the formation of a dark state.
Comment: 9 pages, 6 figures
Databáze: arXiv