Implementation of optimal phase-covariant cloning machines
arXiv:quant-ph/0609105 · doi:10.1103/PhysRevA.76.012330
Abstract
The optimal phase covariant cloning machine (PQCM) broadcasts the information associated to an input qubit into a multi-qubit systems, exploiting a partial a-priori knowledge of the input state. This additional a priori information leads to a higher fidelity than for the universal cloning. The present article first analyzes different experimental schemes to implement the 1->3 PQCM. The method is then generalized to any 1->M machine for odd value of M by a theoretical approach based on the general angular momentum formalism. Finally different experimental schemes based either on linear or non-linear methods and valid for single photon polarization encoded qubits are discussed.
7 pages, 3 figures
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- Entanglement criteria for microscopic-macroscopic systems
- Experimental continuous variable cloning of partial quantum information
- Procedures for realizing an approximate universal NOT gate
- Decoherence, Einselection and Classicality of a Macroscopic Quantum Superposition generated by Quantum Cloning
- Anomalous lack of decoherence of the Macroscopic Quantum Superpositions based on phase-covariant Quantum Cloning
- Experimental test of the no signaling theorem
- Efficient Amplification of Photonic Qubits by Optimal Quantum Cloning
- Anomalous resilient to decoherence macroscopic quantum superpositions generated by universally covariant optimal quantum cloning
- Cloning of arbitrary mirror-symmetric distributions on Bloch sphere: Optimality proof and proposal for practical photonic realization
- Experimental demonstration of error-insensitive approximate universal-NOT gates
- Variational quantum cloning machine on an integrated photonic interferometer