TY - GEN
T1 - Upper bounds for the security of differential-phase-shift quantum key distribution with weak coherent states
AU - Curty, Marcos
AU - Tamaki, Kiyoshi
AU - Moroder, Tobias
AU - Gómez-Sousa, Hipólito
PY - 2009
Y1 - 2009
N2 - In this paper we present limitations imposed by sequential attacks on the maximal distance achievable by a differential-phase-shift (DPS) quantum key distribution (QKD) protocol with weak coherent pulses. Specifically, we compare the performance of two possible sequential attacks against DPS QKD where Eve realizes, respectively, optimal unambiguous state discrimination of Alice's signal states, and optimal unambiguous discrimination of the relative phases between consecutive signal states. We show that the second eavesdropping strategy provides tighter upper bounds for the security of a DPS QKD scheme than the former one.
AB - In this paper we present limitations imposed by sequential attacks on the maximal distance achievable by a differential-phase-shift (DPS) quantum key distribution (QKD) protocol with weak coherent pulses. Specifically, we compare the performance of two possible sequential attacks against DPS QKD where Eve realizes, respectively, optimal unambiguous state discrimination of Alice's signal states, and optimal unambiguous discrimination of the relative phases between consecutive signal states. We show that the second eavesdropping strategy provides tighter upper bounds for the security of a DPS QKD scheme than the former one.
KW - Differential-phase-shift quantum key distribution
KW - Intercept-resend attack
KW - Quantum cryptography
KW - Security
KW - Sequential attack
KW - Unambiguous state discrimination
UR - http://www.scopus.com/inward/record.url?scp=70450178566&partnerID=8YFLogxK
U2 - 10.1063/1.3131346
DO - 10.1063/1.3131346
M3 - 会議への寄与
AN - SCOPUS:70450178566
SN - 9780735406476
T3 - AIP Conference Proceedings
SP - 351
EP - 354
BT - Quantum Communication, Measurement and Computing (QCMC) - The Ninth International Conference
T2 - 9th International Conference on Quantum Communication, Measurement And Computing, QCMC
Y2 - 19 August 2009 through 24 August 2009
ER -