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Abstract
The entanglement between Gaussian entangled states can be increased by non-Gaussian operations. We design a new scheme, named coherent photon addition, which can coherently add one photon generated by a spontaneous parametric down-conversation process to Gaussian quadrature-entangled light pulses created by a non-degenerate optical parametric amplifier. This operation can increase the entanglement of input two-mode Gaussian states as an entanglement distillation, and provides us with a new method of non-Gaussian operation. This scheme can also help us to study the decoherence of adding one- to two-mode Gaussian states from coherent photon addition to normal photon addition.
Acknowledgements
The authors thank Ai-Ping Fang and Yang Yang for interesting and helpful discussion. This work is supported by the Fundamental Research Funds for the Central Universities, the National Fundamental Research Program (2010CB923102) and National Natural Science Foundation of China (Grant Nos. 11004158, 10774117, 11074198, and 11074199).