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

Abstract : 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 jαj 2 ¼ 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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https://hal.archives-ouvertes.fr/hal-03271374
Contributor : Hanna Le Jeannic <>
Submitted on : Friday, June 25, 2021 - 4:30:25 PM
Last modification on : Tuesday, July 13, 2021 - 3:26:50 AM

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PhysRevLett.115.023602.pdf
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K Huang, H Le Jeannic, J Ruaudel, V Verma, M Shaw, et al.. Optical Synthesis of Large-Amplitude Squeezed Coherent-State Superpositions with Minimal Resources. Physical Review Letters, American Physical Society, 2015, 115, pp.023602. ⟨10.1103/physrevlett.115.023602⟩. ⟨hal-03271374⟩

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