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arXiv:quant-ph/0207039 · Physical Review A

Universal quantum cloning in cavity QED

P. Milman, H. Ollivier, J. M. Raimond

Published Jan 23, 2003• 60 citations
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Abstract

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-$Q$ 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.

DOI
10.1103/physreva.67.012314

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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 1\ensuremath→2\stackrel{\ensuremath{\rightarrow}}{1}21\ensuremath→​2 cloning process using either a one- or a two-cavity configuration.
We propose a scheme to implement the $\stackrel{\ensuremath{\rightarrow}}{1}2$ 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 a scheme for realizing the 1 → 2 universal quantum cloning machine (UQCM) with superconducting quantum interference device (SQUID) qubits in circuit quantum electrodynamics (circuit QED). In this scheme, in order to implement UQCM, we only need phase shift gate operation on SQUID qubits and the Raman transitions. The cavity number we need is only one. Thus our scheme is simple and has advantages in the experimental realization. Furthermore, both the cavity and the SQUID qubits are virtually excited, so the decoherence can be neglected.