Measuring Entangled Qutrits and Their Use for Quantum Bit Commitment
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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 characterisation 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.
Paper updated to match published version; 5 pages, 4 figures, images have been included at slightly lower quality for the archive
Paper updated to match published version; 5 pages, 4 figures, images have been included at slightly lower quality for the archive