Generating superposition of up-to three photons for continuous variable quantum information processing
Mitsuyoshi Yukawa, Kazunori Miyata, Takahiro Mizuta, Hidehiro Yonezawa, Petr Marek, Radim Filip, Akira Furusawa · Optics Express · 2013
We develop an experimental scheme based on a continuous-wave (cw) laser for generating arbitrary superpositions of photon number states. In this experiment, we successfully generate superposition states of zero to three photons, namely advanced versions of superpositions of two and three coherent states. They are fully compatible with developed quantum teleportation and measurement-based quantum operations with cw lasers. Due to achieved high detection efficiency, we observe, without any loss correction, multiple areas of negativity of Wigner function, which confirm strongly nonclassical nature of the generated states.