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Volumn 69, Issue 1, 2004, Pages 123091-1230916

Coherent-pulse implementations of quantum cryptography protocols resistant to photon-number-splitting attacks

Author keywords

[No Author keywords available]

Indexed keywords

AMPLIFICATION; ATTENUATION; ELEMENTARY PARTICLES; INTEGRAL EQUATIONS; MATHEMATICAL MODELS; OPTICAL FIBERS; PERTURBATION TECHNIQUES; POISSON EQUATION; QUANTUM THEORY;

EID: 4544222212     PISSN: 10502947     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article
Times cited : (96)

References (38)
  • 5
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    • note
    • It is a well-known fact that the existence of a perfect quantum cloning machine would allow to beat Heisenberg's uncertainty principle.
  • 10
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    • K. Mølmer, Phys. Rev. A 55, 3195 (1997); S. J. van Enk and C. A. Fuchs, Quantum Inf. Comput. 2, 151 (2002).
    • (1997) Phys. Rev. A , vol.55 , pp. 3195
    • Mølmer, K.1
  • 18
    • 85015772887 scopus 로고    scopus 로고
    • note
    • It has been shown in W. Xiang-bin, quant-ph/0110089, that no finite coherent attack is more powerful than the incoherent one when Eve's measurement takes place before the error correction and privacy amplification process. However his demonstration does not apply to the case of a coherent attack on an infinite number of pulses.
  • 22
    • 85015749529 scopus 로고    scopus 로고
    • note
    • We take α = 0.25 dB/km for all the figures in this paper.
  • 23
    • 85015734976 scopus 로고    scopus 로고
    • note
    • We believe that Eve must necessarily have access to Bob's lab in order to modify his detectors. In contrary to this, one might think that Eve is able to shift the signals she wants to be detected into a wavelength region of higher detector efficiency. But this can be simply avoided by putting a narrow filter before the detector. Or, she can send pulses with large mean photon number whenever she wants the pulse to be detected, but this produces a significant increase of the double counts when Bob chooses the wrong measurement.
  • 24
    • 85015773086 scopus 로고    scopus 로고
    • note
    • z with eigenvalues ±1.
  • 30
    • 85015761158 scopus 로고    scopus 로고
    • note
    • ⊗3 [14]. It is very plausible that there is no measurement using just linear optics reaching the optimal probability of unambiguous discrimination.
  • 31
    • 85015761155 scopus 로고    scopus 로고
    • note
    • Incidentally note that using the nonperfect but subpoissonian sources of Ref. [8], this distance can be further increased, since the higher photon-number components are proportionally much smaller than in the poissonian case.
  • 32
    • 0001283653 scopus 로고    scopus 로고
    • N. J. Cerf, Phys. Rev. Lett. 84, 4497 (2000); J. Mod. Opt. 47, 187 (2000).
    • (2000) Phys. Rev. Lett. , vol.84 , pp. 4497
    • Cerf, N.J.1
  • 33
    • 0034652056 scopus 로고    scopus 로고
    • N. J. Cerf, Phys. Rev. Lett. 84, 4497 (2000); J. Mod. Opt. 47, 187 (2000).
    • (2000) J. Mod. Opt. , vol.47 , pp. 187
  • 36
    • 85015797914 scopus 로고    scopus 로고
    • note
    • After completition of this work, the optimal 2→3 phase covariant cloning machine was found in G. M. D'Ariano and C. Macchiavello, quant-ph/0301175. There, the optimal fidelity is shown to be equal to (1 + √7/3)/2∼0.9409, slightly larger than the one given in Appendix D of the present paper, (6+2√2 + √6)/12∼0.9398.
  • 38
    • 85015762150 scopus 로고    scopus 로고
    • note
    • b does not provide any advantage to the honest parties when they use this alternative encoding.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.