Measuring Entangled Qutrits and Their Use for Quantum Bit Commitment

Details Measuring Entangled Qutrits and Their Use for Quantum Bit Commitment Measuring Entangled Qutrits and Their Use for Quantum Bit Commitment

2003-12-09

arxiv.org/abs/quant-ph/0312072v2

Phys.Rev.Lett.93:053601,2004

Physics

Quantum Physics

Paper updated to match published version; 5 pages, 4 figures, images have been included at slightly lower quality for the arch

Scientific paper

10.1103/PhysRevLett.93.053601

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.

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