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Phys Rev Lett. 2015 Jul 10;115(2):023602. Epub 2015 Jul 9.

Optical Synthesis of Large-Amplitude Squeezed Coherent-State Superpositions with Minimal Resources.

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Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France, 4 place Jussieu, 75005 Paris, France.
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.
National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA.
Department of Optics, Palacký University, 17. listopadu 1192/12, 77146 Olomouc, Czech Republic.


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 |α|(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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