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Acta Sinica Quantum Optica

Implementation and Error-correction of a Phase-covariant Quantum Cloning Machine in Cavity QED

Ai‐Dong Zhu

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

We propose a scheme for 1→2 phase-covariant quantum cloning machine(PCCM) with the interaction between N two-level atoms and a vacuum cavity field.Meanwhile,based on this cloning machine,we also present a scheme for quantum error correction,in which the decoherence effects caused by phase or bit flip errors are considered.We just need to perform a Bell measurement on the last two qubits and rotate the first qubit along a suitable axis to recover the original unknown state.

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Communications in Theoretical Physics•Jun 1, 2008•2 citations
We propose a scheme for 1→2 phase-covariant quantum cloning machine(PCCM) with the interaction between N two-level atoms and a vacuum cavity field.Meanwhile,based on this cloning machine,we also present a scheme for quantum error correction,in which the decoherence effects caused by phase or bit flip errors are considered.We just need to perform a Bell measurement on the last two qubits and rotate the first qubit along a suitable axis to recover the original unknown state.
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.