Single microwave photon source using circuit QED

In circuit QED, a superconducting charge qubit is fabricated inside a high-quality factor transmission line resonator [1]. This opens the possibility to probe the regime of strong coupling of cavity QED using microwave photons and artificial atoms. This physics was experimentally investigated in the resonant [2] and in the dispersive [3] regime. In this talk, we will show how this setup could be used to generate single microwave photons on demand. Moreover, by using a different circuit QED layout with two resonators, photon generation could be tagged. The possibility to use a similar setup to detect single photons will also be discussed. [1] A. Blais, R.-S. Huang, A. Wallraff, S. M. Girvin and R. J. Schoelkopf, Phys. Rev. A \textbf{69}, 062320 (2004). [2] A. Wallraff, D. Schuster, A. Blais, L. Frunzio, R.-S. Huang, J. Majer, S. Kumar, S. M. Girvin and R. J. Schoelkopf, Nature \textbf{431}, 162 (2004). [3] D. I. Schuster, A. A. Houck, J. A. Schreier, A. Wallraff, J. M. Gambetta, A. Blais, L. Frunzio, B. Johnson, M. H. Devoret, S. M. Girvin and R. J. Schoelkopf, Cond-mat/0608693.