Experimental direct estimation of nonlinear functionals of photonic quantum states via interferometry with a controlled-swap operation | Zendy

Sang Min Lee | Zendy; SangKyung Choi | Zendy; Hee Su Park | Zendy

Open Access

Experimental direct estimation of nonlinear functionals of photonic quantum states via interferometry with a controlled-swap operation

Author(s) -

Sang Min Lee,

SangKyung Choi,

Hee Su Park

Publication year - 2013

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.21.017824

Subject(s) - interferometry , photonics , physics , swap (finance) , optics , nonlinear system , photon , qubit , visibility , interference (communication) , quantum , refractive index , quantum mechanics , computer science , telecommunications , channel (broadcasting) , finance , economics

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.

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