Universal linear-optical quantum device: experimental implementation

  • Antonín Černoch
  • Jan Soubusta
  • Miloslav Dušek
  • Jaromír Fiurášek


We report on a linear-optical realization of a universal quantum device working with polarization encoded quantum bits. It can serve as a two-qubit partial SWAP entangling gate. The same device can be used also for filtering symmetric and antisymmetric parts of the input two-photon state. Through a partial symmetrization, the universal asymmetric quantum cloning of single-photon polarization states can be achieved. All functions can be implemented in one setup by changing the classical parameters like the phase shift and attenuation only. For the characterization of the device, the reconstruction of the output state by full process tomography was performed.


quantum information quantum gate universal cloning 


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Copyright information

© Springer Science+Business Media, Inc. 2009

Authors and Affiliations

  • Antonín Černoch
    • 1
  • Jan Soubusta
    • 1
  • Miloslav Dušek
    • 2
  • Jaromír Fiurášek
    • 2
  1. 1.Joint Laboratory of Optics of Palacký University and Institute of Physics of the Academy of Sciences of the Czech RepublicTřída 17. listopadu 50 AOlomoucCzech Republic
  2. 2.Department of OpticsPalacký UniversityOlomoucCzech Republic

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