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

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 resourc...

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Bibliographic Details
Published in:Physical review letters 2015-07, Vol.115 (2), p.023602-023602, Article 023602
Main Authors: Huang, K, Le Jeannic, H, Ruaudel, J, Verma, V B, Shaw, M D, Marsili, F, Nam, S W, Wu, E, Zeng, H, Jeong, Y-C, Filip, R, Morin, O, Laurat, J
Format: Article
Language:English
Subjects:
Accumulation
Coherence
Nanowires
Non-Gaussian
Optics
Optimization
Physics
Propagation
Quantum Physics
Superconductivity
Synthesis
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.115.023602