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.
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Gerrits et al. (2010) studied this question.
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