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International Journal of Modern Physics B

PROPOSAL FOR A GENERAL QUANTUM CLONING MACHINE VIA DISTANT QUBITS IN A QUANTUM NETWORK

Yang Yu, Ye Liu

Published Aug 13, 2013• 1 citation
Publisher

Abstract

We propose a scheme for implementing a general quantum cloning machine with distant qubits. By regulating some times and phases, we can easily realize almost all kinds of quantum cloning machines (optimal phase-covariant cloning, optimal universal quantum cloning, optimal economical phase-covariant cloning and optimal real state cloning). The quantum cloning machine may have important applications in quantum cryptography for quantum network.

DOI
10.1142/s0217979213501543

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We propose a scheme for implementing a general quantum cloning machine with distant qubits. By regulating some times and phases, we can easily realize almost all kinds of quantum cloning machines (optimal phase-covariant cloning, optimal universal quantum cloning, optimal economical phase-covariant cloning and optimal real state cloning). The quantum cloning machine may have important applications in quantum cryptography for quantum network.
Quantum cloning relates to the security of quantum computation and quantum communication. In this paper, firstly we propose a feasible unified scheme to implement optimal 1 → 2 universal, 1 → 2 asymmetric and symmetric phase-covariant cloning, and 1 → 2 economical phase-covariant quantum cloning machines only via a beam splitter. Then 1 → 3 economical phase-covariant quantum cloning machines also can be realized by adding another beam splitter in context of linear optics. The scheme is based on the interference of two photons on a beam splitter with different splitting ratios for vertical and horizontal polarization components. It is shown that under certain condition, the scheme is feasible by current experimental technology.