Phys. Rev. Lett. 93, 053601 (2004) [4 pages]Measuring Entangled Qutrits and Their Use for Quantum Bit CommitmentReceived 30 November 2003; published 26 July 2004 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.053601
DOI:
10.1103/PhysRevLett.93.053601
PACS:
42.50.Dv, 03.65.Wj, 03.67.Dd, 03.67.Mn
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