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Foundations of Physics

Zeno Subspaces for Coupled Superconducting Qubits

Paolo Facchi A, Rosario Fazio, Giuseppe Florio, Saverio Pascazio, Tetsuya Yoneda

Published Apr 1, 2006• 3 citations
Publisher
DOI
10.1007/s10701-005-9033-9

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We present an approach for implementation of a $1\ensuremath{\rightarrow}3$ orbital state quantum cloning machine based on the quantum Zeno dynamics via manipulating three rf superconducting quantum interference device (SQUID) qubits to resonantly interact with a superconducting cavity assisted by classical fields. Through appropriate modulation of the coupling constants between rf SQUIDs and classical fields, the quantum cloning machine can be realized within one step. We also discuss the effects of decoherence such as spontaneous emission and the loss of cavity in virtue of master equation. The numerical simulation result reveals that the quantum cloning machine is especially robust against the cavity decay, since all qubits evolve in the decoherence-free subspace with respect to cavity decay due to the quantum Zeno dynamics.