Measuring entangled qutrits and their use for quantum bit commitment.

  title={Measuring entangled qutrits and their use for quantum bit commitment.},
  author={N K Langford and R B Dalton and Michael D. Harvey and Jeremy Lloyd O'Brien and G. J. Pryde and Alexei Gilchrist and Stephen D. Bartlett and A. G. White},
  journal={Physical review letters},
  volume={93 5},
We produce and holographically measure entangled qudits encoded in transverse spatial modes of single photons. With the novel use of a quantum state tomography method that only requires two-state superpositions, we achieve the most complete characterization of entangled qutrits to date. Ideally, entangled qutrits provide better security than qubits in quantum bit commitment: we model the sensitivity of this to mixture and show experimentally and theoretically that qutrits with even a small… CONTINUE READING
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