A robust one-step catalytic machine for high fidelity anti-cloning and W-state generation in a multi-qubit system

Details A robust one-step catalytic machine for high fidelity anti-cloning and W-state generation in a multi-qubit system A robust one-step catalytic machine for high fidelity anti-cloning and W-state generation in a multi-qubit system

2004-09-16

arxiv.org/abs/quant-ph/0409104v1

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.94.110502

We propose a physically realizable machine which can either generate multiparticle W-like states, or implement high fidelity $1 \to M$ ($M=1,2,... \infty$) anti-cloning of an arbitrary qubit state, in a single step. Moreover this universal machine acts as a catalyst in that it is unchanged after either procedure, effectively resetting itself for its next operation. It also possesses an inherent {\em immunity} to decoherence. Most importantly in terms of practical multi-party quantum communication, the machine's robustness in the presence of decoherence actually {\em increases} as the number of qubits $M$ increases.

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