期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.023602
关键词
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资金
- ERA-Net CHIST-ERA (QScale)
- European Research Council (Starting Grant HybridNet)
- Foundation for the Author of National Excellent Doctoral Dissertation of China [PY2012004]
- China Scholarship Council
- DARPA Information in a Photon (InPho) program
- QUINESS program
- Czech Science Foundation [GA14-36681G]
We propose and experimentally realize a novel versatile protocol that allows the quantum state engineering of heralded optical coherent-state superpositions. This scheme relies on a two-mode squeezed state, linear mixing, and a n-photon detection. It is optimally using expensive non-Gaussian resources to build up only the key non-Gaussian part of the targeted state. In the experimental case of a two-photon detection based on high-efficiency superconducting nanowire single-photon detectors, the freely propagating state exhibits a 67% fidelity with a squeezed even coherent-state superposition with a size vertical bar alpha vertical bar(2) = 3. The demonstrated procedure and the achieved rate will facilitate the use of such superpositions in subsequent protocols, including fundamental tests and optical hybrid quantum information implementations.
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