Single observable concurrence measurement without simultaneous copies
Salles, Alejo * de Melo, Fernando * × Retamal, Juan Carlo * de Matos Filho, Ruynet * Zagury, Nicim * #
Published by the American Physical Society through the American Institute of Physics
Physical Review A, Atomic, Molecular and Optical Physics vol:74 issue:6 pages:-
We present a protocol that allows us to obtain the concurrence of any two-qubit pure state by performing a minimal and optimal tomography of one of the subsystems through measuring a single observable of an ancillary four-dimensional qudit. An implementation for a system of trapped ions is also proposed, which can be achieved with present-day experimental techniques.