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Journal of Atomic, Molecular, and Optical Physics
Volume 2012 (2012), Article ID 469043, 9 pages
Research Article

The Advantages of Not Entangling Macroscopic Diamonds at Room Temperature

1Center for Optical Coherence Tomography and Modern Physics, Department of Orthopedic Surgery, Brigham and Women's Hospital, 75 Francis Street, MRB-114, Boston, MA 02115, USA
2Center for Optical Coherence Tomography and Modern Physics, Department of Orthopedic Surgery, Harvard Medical School, 25 Shattuck Street, Boston, MA 02115, USA
3Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Room 36-360, 77 Massachusetts Avenue, Cambridge, MA 02139, USA

Received 6 August 2012; Revised 2 December 2012; Accepted 12 December 2012

Academic Editor: Alan Migdall

Copyright © 2012 Mark E. Brezinski. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The recent paper entitled by K. C. Lee et al. (2011) establishes nonlocal macroscopic quantum correlations, which they term “entanglement”, under ambient conditions. Photon(s)-phonon entanglements are established within each interferometer arm. However, our analysis demonstrates, the phonon fields between arms become correlated as a result of single-photon wavepacket path indistinguishability, not true nonlocal entanglement. We also note that a coherence expansion (as opposed to decoherence) resulted from local entanglement which was not recognized. It occurred from nearly identical Raman scattering in each arm (importantly not meeting the Born and Markovian approximations). The ability to establish nonlocal macroscopic quantum correlations through path indistinguishability rather than entanglement offers the opportunity to greatly expand quantum macroscopic theory and application, even though it was not true nonlocal entanglement.