Physics – Quantum Physics
Scientific paper
2003-12-09
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.
Bartlett Stephen D.
Dalton Rohan B.
Gilchrist Alexei
Harvey Michael D.
Langford Nathan K.
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