Realization of Universal Optimal Quantum Machines by Projective Operators and Stochastic Maps

Details Realization of Universal Optimal Quantum Machines by Projective Operators and Stochastic Maps Realization of Universal Optimal Quantum Machines by Projective Operators and Stochastic Maps

2004-07-22

arxiv.org/abs/quant-ph/0407176v1

Phys. Rev. A 70, 052305 (2004)

Physics

Quantum Physics

11 pages, 7 figures

Scientific paper

10.1103/PhysRevA.70.052305

Optimal quantum machines can be implemented by linear projective operations. In the present work a general qubit symmetrization theory is presented by investigating the close links to the qubit purification process and to the programmable teleportation of any generic optimal anti-unitary map. In addition, the contextual realization of the N ->M cloning map and of the teleportation of the N->(M-N) universal NOT gate is analyzed by a novel and very general angular momentum theory. An extended set of experimental realizations by state symmetrization linear optical procedures is reported. These include the 1->2 cloning process, the UNOT gate and the quantum tomographic characterization of the optimal partial transpose map of polarization encoded qubits.

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