Phys. Rev. A 67, 022303 (2003) [4 pages]Entanglement of electromagnetic fieldsReceived 19 June 2002; published 10 February 2003 Given a quantum state of the electromagnetic field, one is, in principle, free to redefine the field modes. We show here how the amount of entanglement in a given state depends on redefinitions of the modes, and calculate the minimum and maximum entanglement over all such redefinitions for several examples. Redefinitions can also be interpreted as transformations that one can apply actively, for example, in order to create nonlocal entanglement. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.67.022303
DOI:
10.1103/PhysRevA.67.022303
PACS:
03.67.-a, 42.50.-p, 03.70.+k
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