Measuring entangled qutrits and their use for quantum bit commitment |
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Authors: | Langford N K Dalton R B Harvey M D O'Brien J L Pryde G J Gilchrist A Bartlett S D White A G |
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Institution: | Department of Physics, University of Queensland, Brisbane, QLD 4072, Australia. |
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Abstract: | 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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