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We have created heralded coherent-state superpositions (CSSs) by subtracting up to three photons from a pulse of squeezed vacuum light. To produce such CSSs at a sufficient rate, we used our high-efficiency photon-number-resolving transition edge sensor to detect the subtracted photons. This experiment is enabled by and utilizes the full photon-number-resolving capabilities of this detector. The CSS produced by three-photon subtraction had a mean-photon number of 2. 75-₀. ₂₄^+0. 06 and a fidelity of 0. 59-₀. ₁₄^+0. 04 with an ideal CSS. This confirms that subtracting more photons results in higher-amplitude CSSs.
Gerrits et al. (Thu,) studied this question.