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Communications in Theoretical Physics

Scheme for Implementing Quantum Cloning Restoring Machine in Cavity QED

Long-Bao Yu, Wen‐Hai Zhang, Ye Liu

Published Feb 1, 2007• 2 citations
Publisher

Abstract

We propose an experimentally feasible scheme for implementing quantum restoring machine of the optimal universal 1→2 quantum cloning machine in the context of cavity QED. In our scheme, two atoms (the clones) simultaneously interact with a cavity field, and meanwhile they are driven by a classical field. Then an arbitrary unknown input state can be restored in the ancilla by applying appropriate unitary local operation.

DOI
10.1088/0253-6102/47/2/011

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We propose an experimentally feasible scheme for implementing quantum restoring machine of the optimal universal 1→2 quantum cloning machine in the context of cavity QED. In our scheme, two atoms (the clones) simultaneously interact with a cavity field, and meanwhile they are driven by a classical field. Then an arbitrary unknown input state can be restored in the ancilla by applying appropriate unitary local operation.
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.
Schemes for implementing a 1 ? 2 optimal universal quantum cloning machine (UQCM) and a 1 ? 3 ancilla-free optimal phase-covariant quantum cloning machine (PCCM) are proposed by manipulating the transverse spin?spin interactions of quantum dots mediated by a vacuum single-mode cavity. The interactions among different quantum dots are selectively controlled by the classical laser fields. These quantum cloning machines are more robust due to the very long spin decoherence time of quantum dots. Furthermore, the experimental implementation is simplified in comparison with those using atoms as qubits. The quantum dots are embedded in the cavity simultaneously; hence the troubles caused by the qubits passing through multiple cavities are effectively avoided.