Physics – Quantum Physics
Scientific paper
2004-08-19
Phys. Rev. A 71, 060302 (2005)
Physics
Quantum Physics
Final published form
Scientific paper
10.1103/PhysRevA.71.060302
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 non-linearity, generated, for example, by electromagnetically induced transparency. The symmetry analyzer is non-destructive, and works for small values of the cross-Kerr coupling. Furthermore, this device can be used to construct a non-destructive Bell state detector.
Barrett Sean D.
Beausoleil Raymond G.
Kok Pieter
Munro William J.
Nemoto Keiichi
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