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APS » Journals » Phys. Rev. Lett. » Volume 95 » Issue 9
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Phys. Rev. Lett. 95, 090401 (2005) [4 pages]

Detection of Macroscopic Entanglement by Correlation of Local Observables

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Akira Shimizu* and Tomoyuki Morimae
Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Tokyo 153-8902, Japan and PRESTO, Japan Science and Technology Corporation, 4-1-8 Honcho, Kawaguchi, Saitama, Japan

Received 12 April 2005; published 23 August 2005

We propose a correlation of local observables on many sites in macroscopic quantum systems. By measuring the correlation one can detect, if any, superposition of macroscopically distinct states, which we call macroscopic entanglement, in arbitrary quantum states that are (effectively) homogeneous. Using this property, we also propose an index of macroscopic entanglement.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.090401
DOI:
10.1103/PhysRevLett.95.090401
PACS:
03.65.Ud, 03.65.Ta, 03.67.Mn, 05.70.Fh

*Electronic address: shmz@ASone.c.u-tokyo.ac.jp

 
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