Phys. Rev. Lett. 92, 180403 (2004) [4 pages]Stability of Macroscopic Entanglement under DecoherenceReceived 25 July 2003; published 6 May 2004 We investigate the lifetime of macroscopic entanglement under the influence of decoherence. For Greenberger-Horne-Zeilinger–type superposition states, we find that the lifetime decreases with the size of the system (i.e., the number of independent degrees of freedom), and the effective number of subsystems that remain entangled decreases with time. For a class of other states (e.g., cluster states), however, we show that the lifetime of entanglement is independent of the size of the system. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.180403
DOI:
10.1103/PhysRevLett.92.180403
PACS:
03.65.Yz, 03.65.Ud, 03.67.Mn
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