Realization of universal optimal quantum machines by projective operators and stochastic maps

Journal Article · Mon Nov 01 04:00:00 EST 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.70.052305· OSTI ID:20646181

Sciarrino, F; Sias, C; Ricci, M; De Martini, F ^[1]

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1. 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, Journal Name: Physical Review. A Journal Issue: 5 Vol. 70; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR MOMENTUM
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GATING CIRCUITS
INFORMATION THEORY
LOGIC CIRCUITS
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POLARIZATION
QUANTUM MECHANICS
STOCHASTIC PROCESSES
TOMOGRAPHY