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arXiv:quant-ph/0301029 · Physical Review A

Scheme for the implementation of a universal quantum cloning machine via cavity-assisted atomic collisions in cavity QED

Xu‐Bo Zou, K. Pahlke, Wolfgang M. Mathis

Published Feb 28, 2003• 71 citations
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Abstract

We propose a scheme to implement the $\stackrel{\ensuremath{\rightarrow}}{1}2$ universal quantum cloning machine of Buzek and Hillery [Phys. Rev. A $54,$ 1844 (1996)] in the context of cavity QED. The scheme requires cavity-assisted collision processes between atoms, which cross through nonresonant cavity fields in the vacuum states. The cavity fields are only virtually excited to face the decoherence problem. That's why the requirements on the cavity quality factor can be loosened.

DOI
10.1103/physreva.67.024304

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We propose a scheme to implement the 1\ensuremath→2\stackrel{\ensuremath{\rightarrow}}{1}21\ensuremath→​2 universal quantum cloning machine of Buzek and Hillery [Phys. Rev. A 54,54,54, 1844 (1996)] in the context of cavity QED. The scheme requires cavity-assisted collision processes between atoms, which cross through nonresonant cavity fields in the vacuum states. The cavity fields are only virtually excited to face the decoherence problem. That's why the requirements on the cavity quality factor can be loosened.
We propose an implementation of an universal quantum cloning machine [UQCM, V. Buzek and M. Hillery, Phys. Rev. A 54, 1844 (1996)] in a cavity quantum electrodynamics experiment. This UQCM acts on the electronic states of atoms that interact with the electromagnetic field of a high-QQQ cavity. We discuss here the specific case of the $\stackrel{\ensuremath{\rightarrow}}{1}2$ cloning process using either a one- or a two-cavity configuration.
We propose a scheme for implementing a partial general quantum cloning machine with superconducting quantum-interference devices coupled to a nonresonant cavity. By regulating the time parameters, our system can perform optimal symmetric (asymmetric) universal quantum cloning, optimal symmetric (asymmetric) phase-covariant cloning, and optimal symmetric economical phase-covariant cloning. In the scheme the cavity is only virtually excited, thus, the cavity decay is suppressed during the cloning operations.