Particle beams 2 Single-photon level Backward-waves 1 Bandwidth 1 Bimodal cavity 1 Broadband amplification 1 Broadband amplifiers 1 Cavity mode 1 Deterministics 1 Economic and social effects 1 Floquet modes 1 Measurements of 1 Nonlinear optics 1 Optical parametric amplifiers 1 Parametric amplifiers 1 Photon emissions 1 Photon pairs 1 Photons 1 Quantum communication 1 Quantum information processing 1 Quantum limited 1 Quantum measurement 1 Quantum optics 1 Science and Technology 1 Single photons 1 Single-atoms 1 Trapped atoms 1 Travelling waves 1 Wave generation 1