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Updated: May 8, 2026
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Experimental direct estimation of nonlinear functionals of photonic quantum states via interferometry with a
Sang Min Lee1, Sang-Kyung Choi, Hee Su Park
1Korea Research Institute of Standards and Science, Daejeon 305-340, South Korea.
Optics Express
|August 14, 2013
Abstract:
We propose a multi-photon interferometer with a generalized C-SWAP operation that can estimate Tr[ρ(1)ρ(2)···ρ(n)], a nonlinear functional of n photonic density matrices. The scheme is demonstrated for three single-photon states whose overlap is experimentally measured as the interference visibility of a control qubit encoded into photonic paths. The validity of this method is verified by comparing the visibility with the results of Hong-Ou-Mandel experiments.
