Universal discriminator for completely unknown optical qubits

Details Universal discriminator for completely unknown optical qubits Universal discriminator for completely unknown optical qubits

2007-06-16

arxiv.org/abs/0706.2429v2

Phys. Rev. A 76, 032301 (2007)

Physics

Quantum Physics

accepted publication version in PRA

Scientific paper

10.1103/PhysRevA.76.032301

We propose an experimental setup that is capable of unambiguously discriminating any pair of linearly independent single photon polarization qubits, about which we don't have any knowledge except that an extra pair of these unknown states are provided as the reference. This setup, which is constructed with optical CNOT gates, weak cross Kerr non-linearities, Bell state analysers and other linear optical elements, transforms the unknown triple photon input states to the corresponding single photon states to be deterministically processed by linear optics circuit. The optimal discrimination of the unknown states is achieved by this setup.

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