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Time-shift attack in practical quantum cryptosystems
Bing Qi, Chi-Hang Fred Fung, Hoi-Kwong Lo +1
Recently, a new type of attack, which exploits the efficiency mismatch of two single photon detectors (SPD) in a quantum key distribution (QKD) system, has been proposed. In this p…
Quantum key distribution based on arbitrarily-weak distillable entangled states
Karol Horodecki, Debbie Leung, Hoi-Kwong Lo +1
States with private correlations but little or no distillable entanglement were recently reported. Here, we consider the secure distribution of such states, i.e., the situation whe…
On the performance of two protocols: SARG04 and BB84
Chi-Hang Fred Fung, Kiyoshi Tamaki, Hoi-Kwong Lo
We compare the performance of BB84 and SARG04, the later of which was proposed by V. Scarani et al., in Phys. Rev. Lett. 92, 057901 (2004). Specifically, in this paper, we investig…
Quantum Key Distribution with Vacua or Dim Pulses as Decoy States
Hoi-Kwong Lo
Recently, Hwang has proposed a decoy state method in quantum key distribution (QKD). In Hwang's proposal, the average photon number of the decoy state is about two. Here, we propos…
Conference Key Agreement and Quantum Sharing of Classical Secrets with Noisy GHZ States
Kai Chen, Hoi-Kwong Lo
We propose a wide class of distillation schemes for multi-partite entangled states that are CSS-states. Our proposal provides not only superior efficiency, but also new insights on…
Two-way quantum communication channels
Andrew M. Childs, Debbie W. Leung, Hoi-Kwong Lo
We consider communication between two parties using a bipartite quantum operation, which constitutes the most general quantum mechanical model of two-party communication. We primar…