Experimental realization of linear-optical partial swap gates.
We present a linear-optical implementation of a class of two-qubit partial SWAP gates for polarization states of photons. Different gate operations, including the SWAP and entangling sqrt[SWAP], can be obtained by changing a classical control parameter, namely, the path difference in the interferometer. Reconstruction of output states, full quantum process tomography, and an evaluation of entanglement of formation prove very good performance of the gates.
Joint Laboratory of Optics of Palacký University and Institute of Physics of Academy of Sciences of the Czech Republic, 17. listopadu 50A, 779 07 Olomouc, Czech Republic.
Antonín
A
Cernoch
Jan
J
Soubusta
Lucie
L
Bartůsková
Miloslav
M
Dusek
Jaromír
J
Fiurásek