alexa Generation of large-amplitude coherent-state superposition via ancilla-assisted photon subtraction.
Physics

Physics

Journal of Lasers, Optics & Photonics

Author(s): Takahashi H, Wakui K, Suzuki S, Takeoka M, Hayasaka K,

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Abstract We propose and demonstrate a novel method to generate a large-amplitude coherent-state superposition (CSS) via ancilla-assisted photon subtraction. The ancillary mode induces quantum interference of indistinguishable processes in an extended space, widening the controllability of quantum superposition at the conditional output. We demonstrate this by a simple time-separated two-photon subtraction from continuous wave squeezed light. We observe the largest CSS of traveling light ever reported without correcting any imperfections, which will enable various quantum information applications with CSS states. This article was published in Phys Rev Lett and referenced in Journal of Lasers, Optics & Photonics

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