Detecting nonclassicality in randomly-displaced copies of a squeezed state

We address a fundamental question: Can one determine whether a received signal is squeezed when each copy arrives with a different displacement/amplitude? We introduce an interaction Hamiltonian that converts quadrature squeezing into number squeezing. Using this conversion, we test whether the copies satisfy $g^{(2)}(0)<1$. The Hamiltonian itself does not create nonclassicality; it only transfers it from quadrature squeezing to number squeezing. This allows us to identify squeezing even when individual copies have random displacements.

Source: arXiv:2605.18708v1 - http://arxiv.org/abs/2605.18708v1 PDF: https://arxiv.org/pdf/2605.18708v1 Original Link: http://arxiv.org/abs/2605.18708v1