Realization of universal optimal quantum machines by projective operators and stochastic maps
- Istituto Nazionale per la Fisica della Materia, Dipartimento di Fisica, Universita di Roma 'La Sapienza', Rome, 00185 (Italy)
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 antiunitary map. In addition, the contextual realization of the N{yields}M cloning map and of the teleportation of the N{yields}(M-N) universal-NOT (UNOT) gate is analyzed by a very general angular momentum theory. An extended set of experimental realizations by state symmetrization linear optical procedures is reported. These include the 1{yields}2 cloning process, the UNOT gate and the quantum tomographic characterization of the optimal partial transpose map of polarization encoded qubits.
- OSTI ID:
- 20646181
- Journal Information:
- Physical Review. A, Vol. 70, Issue 5; Other Information: DOI: 10.1103/PhysRevA.70.052305; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
Similar Records
Generalized universal cloning and purification in quantum information by multistep state symmetrization
Realization of the optimal phase-covariant quantum cloning machine