Measuring Entangled Qutrits and Their Use for Quantum Bit Commitment

N. K. Langford, R. B. Dalton, M. D. Harvey, J. L. O’Brien, G. J. Pryde, A. Gilchrist, S. D. Bartlett, and A. G. White
Phys. Rev. Lett. 93, 053601 – Published 26 July 2004

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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  • Received 30 November 2003

DOI:https://doi.org/10.1103/PhysRevLett.93.053601

©2004 American Physical Society

Authors & Affiliations

N. K. Langford*, R. B. Dalton, M. D. Harvey, J. L. O’Brien, G. J. Pryde, A. Gilchrist, S. D. Bartlett, and A. G. White

  • Department of Physics, University of Queensland, Brisbane, QLD 4072, Australia

  • *Corresponding author. Email address: langford@physics.uq.edu.au.

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Issue

Vol. 93, Iss. 5 — 30 July 2004

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