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Phys Rev Lett. 2004 Jul 30;93(5):053601. Epub 2004 Jul 26.

Measuring entangled qutrits and their use for quantum bit commitment.

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Department of Physics, University of Queensland, Brisbane, QLD 4072, Australia.


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 amount of decoherence cannot offer increased security over qubits.

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