Atom waveguide QED for efficient multiphoton sources
Abstract: Engineering quantum states of light and matter provides a critical capability across quantum information science, including quantum metrology or teleportation. Among the different possibilities, the on-demand generation of propagating quantum states of light is of paramount importance as it plays a central role in long-distance quantum communication. However the travelling and non-interacting character of the photons makes difficult their engineering. In this talk, we show how to tailor arbitrary states for propagating photons on demand by using atom-like ensembles coupled to waveguide QED setups. The interaction of optical emitters coupled to one-dimensional (1D) waveguides give rise to strong and long-range interactions that are difficult to obtain with other platforms. We show how to take advantage of these properties to design a deterministic way for engineering photonic states . Moreover, we also show how to engineer the setup for the heralded preparation of these states with even better fidelity and high probability .
 A. Gonzalez-Tudela, V. Paulisch, D. E. Chang, H. J. Kimble, J. I. Cirac. Phys. Rev. Lett. 115, 163603 (2015), V. Paulisch, H. J. Kimble A. Gonzalez-Tudela, arXiv:1512.04803
 A. Gonzalez-Tudela, V. Paulisch, H. J. Kimble, J. I. Cirac. arXiv:1603.01243