Phys. Rev. A 77, 014302 (2008) [3 pages]Consistency of shared reference frames should be reexaminedReceived 30 May 2007; published 14 January 2008 In a recent Letter [ G. Chiribella et al. Phys. Rev. Lett. 98 120501 (2007)], four protocols were proposed to secretly transmit a reference frame. Here we point out that in these protocols an eavesdropper can change the transmitted reference frame without being detected, which means the consistency of the shared reference frames should be reexamined. The way to check the above consistency is discussed. It is shown that this problem is quite different from that in previous protocols of quantum cryptography. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.014302
DOI:
10.1103/PhysRevA.77.014302
PACS:
03.67.Dd, 03.67.Hk, 03.65.Ud
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