Phys. Rev. Lett. 81, 2185–2189 (1998)Transitions in Quantum NetworksReceived 22 January 1998; published in the issue dated 14 September 1998 We consider transitions in quantum networks analogous to those in the two-dimensional Ising model. We show that for a certain network configuration of active components the transition is between the quantum and the classical behavior of the network, and the critical amplification coincides with the fundamental quantum optical cloning limit. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.2185
DOI:
10.1103/PhysRevLett.81.2185
PACS:
03.65.-w, 03.67.-a, 05.50.+q, 42.50.-p
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