https://doi.org/10.1140/epjd/e2012-20728-x
Regular Article
Engineering a C-phase quantum gate: optical design and experimental realization
1
Dipartimento di Fisica, Sapienza Università di Roma,
Piazzale Aldo Moro 5,
00185
Roma,
Italy
2
Istituto Nazionale di Ottica (INO-CNR),
L.go E. Fermi 6, 50125
Firenze,
Italy
a e-mail: andrea.chiuri@gmail.com
Received:
14
December
2011
Received in final form:
12
April
2012
Published online:
26
July
2012
A two qubit quantum gate, namely the C-phase, has been realized by exploiting the longitudinal momentum (i.e. the optical path) degree of freedom of a single photon. The experimental setup used to engineer this quantum gate represents an advanced version of the high stability closed-loop interferometric setup adopted to generate and characterize 2-photon 4-qubit phased Dicke states. Some experimental results, dealing with the characterization of multipartite entanglement of the phased Dicke states are also discussed in detail.
Key words: Topical issue: High Dimensional Quantum Entanglement. Guest editors: Sonja Franke-Arnold, Alessandra Gatti and Nicolas Treps
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2012
