Optical implementation of Deutsch-Jozsa and Bernstein-Vazirani quantum   algorithms in eight dimensions
  We report on a fiber-optics implementation of the Deutsch-Jozsa and Bernstein-Vazirani quantum algorithms for 8-point functions. The measured visibility of the 8-path interferometer is about 97.5%. Potential applications of our setup to quantum communication or cryptographic protocols using several qubits are discussed. 
E. Brainis, L.-P. Lamoureux, N. J. Cerf, Ph. Emplit, M. Haelterman,   and S. Massar