We study the average intensity-intensity correlations signal at the output of a two-mode squeezing device with |𝑁⟩ ⊗ |𝛼⟩ as the two input modes. We show that the input photon-number can be resolved from the average intensity-intensity correlations. In particular, we show jumps in the average intensity-intensity correlations signal as a function of input photon-number N. Therefore, we propose that such a device may be deployed as photon-number-resolving detector at room temperature with high efficiency.

© 2018 The Author(s)

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