ausblenden:
Schlagwörter:
ENTANGLEMENT BREAKING CHANNELS; STANDARD TELECOM FIBER; UNCONDITIONAL
SECURITY; NONORTHOGONAL STATES; COHERENT STATES; CRYPTOGRAPHY;
DISTANCES; PROTOCOL; SYSTEM; LONGOptics; Physics;
Zusammenfassung:
We investigate limitations imposed by detector dead times on the performance of sequential attacks against a differential-phase-shift (DPS) quantum key distribution (QKD) protocol with weak coherent pulses. In particular; we analyze sequential attacks based on unambiguous state discrimination of the signal states emitted by the source and we obtain ultimate upper bounds on the maximal distance achievable by a DPS QKD scheme both for the case of calibrated and uncalibrated devices, respectively.
