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Bidirectional Mapping between a Biphoton Polarization State and a Single-Photon Two-Qubit State |
| LIN Qing |
| College of Information Science and Engineering, Huaqiao University, Xiamen 361021 |
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| Cite this article: |
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LIN Qing 2010 Chin. Phys. Lett. 27 120302 |
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Abstract How to manipulate (operate or measure) single photons efficiently and simply is the basic problem in optical quantum information processing. We first present an efficient scheme to transform a biphoton polarization state to a corresponding single-photon state encoded by its polarization and spatial modes. This single-photon state carries both the information of the controlled and target photons. It will make the realization of bipartite positive-operator-valued measurements efficiently and simply. Moreover, the inverse transformation from the single-photon state back to the corresponding biphoton polarization state is also proposed. Using both the transformations, the realization of the arbitrary two-qubit unitary operation is simple with an M-Z interferometer. All the schemes are feasible with the current experimental technology.
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| Keywords:
03.67.Lx
42.50.Ex
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Received: 19 April 2010
Published: 23 November 2010
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| PACS: |
03.67.Lx
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(Quantum computation architectures and implementations)
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42.50.Ex
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(Optical implementations of quantum information processing and transfer)
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