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      Group transformations and entangled-state quantum gates with directionally unbiased linear-optical multiports

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          Abstract

          The concept of directionally unbiased optical multiports is introduced, in which photons may reflect back out the input direction. A linear-optical implementation is described, and the simplest three-port version studied. Symmetry arguments demonstrate potential for unusual quantum information processing applications. The devices impose group structures on two-photon entangled Bell states and act as universal Bell-state processors to implement probabilistic quantum gates acting on state symmetries. These multiports allow optical scattering experiments to be carried out on arbitrary undirected graphs via linear optics and raise the possibility of linear-optical information processing using group structures formed by optical qudit states.

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          Author and article information

          Journal
          2016-04-21
          Article
          10.1103/PhysRevA.93.043845
          1604.06476
          0a7edf67-cf82-487b-9e83-6af7b86016b3

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          Phys. Rev. A 93, 043845 (2016)
          To appear in Phys. Rev. A
          quant-ph

          Quantum physics & Field theory
          Quantum physics & Field theory

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