Phys. Rev. A 68, 012304 (2003) [4 pages]Solving the liar detection problem using the four-qubit singlet stateReceived 18 February 2003; published 7 July 2003 A method for solving the Byzantine agreement problem [M. Fitzi, N. Gisin, and U. Maurer, Phys. Rev. Lett. 87, 217901 (2001)] and the liar detection problem [A. Cabello, Phys. Rev. Lett. 89, 100402 (2002)] is introduced. The main advantages of this protocol are that it is simpler and is based on a four-qubit singlet state already prepared in the laboratory. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.68.012304
DOI:
10.1103/PhysRevA.68.012304
PACS:
03.67.Hk, 02.50.Le, 03.65.Ud, 03.65.Ta
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