Phys. Rev. A 71, 060302(R) (2005) [4 pages]Symmetry analyzer for nondestructive Bell-state detection using weak nonlinearities
We describe a method to project photonic two-qubit states onto the symmetric and antisymmetric subspaces of their Hilbert space. This device utilizes an ancillary coherent state, together with a weak cross-Kerr nonlinearity, generated, for example, by electromagnetically induced transparency. The symmetry analyzer is nondestructive, and works for small values of the cross-Kerr coupling. Furthermore, this device can be used to construct a nondestructive Bell-state detector. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.71.060302
DOI:
10.1103/PhysRevA.71.060302
PACS:
03.67.Hk, 32.80.−t, 42.50.Gy, 42.65.−k
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