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We propose a physically realizable machine which can either generatemultiparticle 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. Moreoverthis universal machine acts as a catalyst in that it is unchanged after eitherprocedure, effectively resetting itself for its next operation. It alsopossesses an inherent {\em immunity} to decoherence. Most importantly in termsof practical multi-party quantum communication, the machine's robustness in thepresence of decoherence actually {\em increases} as the number of qubits $M$increases.Comment: 4 pages, 2 figure

physical review letters

Robust One-Step Catalytic Machine for High Fidelity Anticloning and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>W</mml:mi></mml:math>-State Generation in a Multiqubit System

Robust One-Step Catalytic Machine for High Fidelity Anticloning andW-State Generation in a Multiqubit System