• Publications
  • Influence
Decoy state quantum key distribution.
TLDR
The method is to use decoy states to detect eavesdropping attacks and has the best of both worlds--enjoying unconditional security guaranteed by the fundamental laws of physics and yet dramatically surpassing some of the best experimental performances reported in the literature.
Decoy-state quantum key distribution with polarized photons over 200 km.
TLDR
A novel and economic way of synchronization method is designed and incorporated into the system, which allows to work at a low frequency of 40kHz and removes the use of highly precise clock.
Field test of a practical secure communication network with decoy-state quantum cryptography.
TLDR
A secure network communication system that operated with decoy-state quantum cryptography in a real-world application scenario and generated quantum keys that were immediately employed for communication applications, including unbreakable real-time voice telephone between any two of the three communication nodes.
Multi-partite quantum cryptographic protocols with noisy GHZ States
  • Kai Chen, H. Lo
  • Computer Science, Mathematics
    Quantum Inf. Comput.
  • 23 April 2004
TLDR
This work proposes a wide class of distillation schemes for multi-partite entangled states that are CSS-states and constructs "prepare-and-measure" protocols which can be implemented with the generation of only a single entangled pair at a time, giving significant simplification over previous experimental implementations.
Experimental free-space quantum teleportation
Researchers demonstrate free-space quantum teleportation through 16 kilometres of air. The results may pave the way for space-based experiments and global scale quantum communication applications.
An integrated space-to-ground quantum communication network over 4,600 kilometres
TLDR
An integrated space-to-ground quantum communication network that combines a large-scale fibre network of more than 700 fibre QKD links and two high-speed satellite- to-ground free-space QKd links is demonstrated, achieving quantum key distribution between more than 150 users over a combined distance of 4,600 kilometres.
Direct and full-scale experimental verifications towards ground–satellite quantum key distribution
Full-scale verifications for establishing quantum cryptography communication via satellites are reported. Three independent experiments using a hot-air balloon are performed: on a rapidly moving
Conference key agreement and quantum sharing of classical secrets with noisy GHZ states
  • Kai Chen, H. Lo
  • Computer Science
    Proceedings. International Symposium on…
  • 22 August 2005
TLDR
This work proposes a wide class of distillation schemes for multi-partite entangled states that are CSS-states and considers the applications of these schemes for two cryptographic tasks - namely, conference key agreement and quantum sharing of classical secrets.
Metropolitan all-pass and inter-city quantum communication network.
TLDR
Real-time voice telephone with one-time pad encoding between any two of the five nodes (four all-pass nodes plus one additional node through relay) is successfully established in the network within 60 km.
Multistage entanglement swapping.
TLDR
By successful realizations of two cascaded photonic entanglement swapping processes,Entanglement is generated and distributed between two photons, that originate from independent sources and do not share any common past.
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