Realization of the optimal phase-covariant quantum cloning machine
- Dipartimento di Fisica and Istituto Nazionale per la Fisica della Materia, Universita di Roma 'La Sapienza', Rome, 00185 (Italy)
In several quantum information (QI) phenomena of large technological importance the information is carried by the phase of the quantum superposition states, or qubits. The phase-covariant cloning machine (PQCM) addresses precisely the problem of optimally copying these qubits with the largest attainable 'fidelity'. We present a general scheme which realizes the 1{yields}3 phase covariant cloning process by a combination of three different QI processes: the universal cloning, the NOT gate, and the projection over the symmetric subspace of the output qubits. The experimental implementation of a PQCM for polarization encoded qubits, the first ever realized with photons, is reported.
- OSTI ID:
- 20786276
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 72; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
Similar Records
Realization of a universal and phase-covariant quantum cloning machine in separate cavities
Implementation of optimal phase-covariant cloning machines
Realization of universal optimal quantum machines by projective operators and stochastic maps
Journal Article
·
Fri Apr 15 00:00:00 EDT 2011
· Physical Review. A
·
OSTI ID:21544576
Implementation of optimal phase-covariant cloning machines
Journal Article
·
Sun Jul 15 00:00:00 EDT 2007
· Physical Review. A
·
OSTI ID:21011197
Realization of universal optimal quantum machines by projective operators and stochastic maps
Journal Article
·
Sun Oct 31 23:00:00 EST 2004
· Physical Review. A
·
OSTI ID:20646181