Fig. 1: Schematic of the preparation of n-photon-added coherent states.
From: Experimental preparation of multiphoton-added coherent states of light
A coherent state \(\left\vert \alpha \right\rangle\) is seeded into the signal mode of an optical parametric amplifier (OPA). Once the residual pump field is filtered out, the signal and idler modes are separated by the polarizing beam splitter (PBS). Detection of n photons at the photon number resolving detector (PNRD) in the idler mode projects the signal mode to the desired n-photon-added coherent state.
