Experimental linear-optical implementation of a multifunctional optimal qubit cloner

0387569 - FZÚ 2013 RIV US eng J - Článek v odborném periodiku
Lemr, K. - Bartkiewicz, K. - Černoch, A. - Soubusta, Jan - Miranowicz, A.
Experimental linear-optical implementation of a multifunctional optimal qubit cloner.
Physical Review. A. Roč. 85, č. 5 (2012), "050307-1"-"050307-4". ISSN 1050-2947
Výzkumný záměr: CEZ:AV0Z10100522
Klíčová slova: quantum cloning * qubit cloner
Kód oboru RIV: BH - Optika, masery a lasery
Impakt faktor: 3.042, rok: 2012

We present the first experimental implementation of a multifunctional device for the optimal cloning of one to two qubits. Previous implementations have always been designed to optimize the cloning procedure with respect to one single type of a priori information about the cloned state. In contrast, our "all-in-one" implementation is optimal for several prominent regimes such as universal cloning, phase-covariant cloning, and also the first ever realized mirror phase-covariant cloning, when the square of the expected value of Pauli's Z operator is known in advance. In all these regimes the experimental device yields clones with almost maximum achievable average fidelity (97.5% of theoretical limit). Our device has a wide range of possible applications in quantum information processing, especially in quantum communication.
Trvalý link: http://hdl.handle.net/11104/0216609