Unitary non-Gaussian nonlinearity is one of the key components required for quantum computation and other developing applications of quantum information processing. Sufficient operation of this kind is still not available, but it can be approximatively implemented with the help of a specifically engineered resource state constructed from individual photons. We present experimental realization and thorough analysis of such quantum resource states and confirm that the state does indeed possess properties of a state produced by unitary dynamics driven by cubic nonlinearity.
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Yukawa et al. (2013) studied this question.
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