Invention:
This technology is a joint quantum key distribution (QKD)-post-quantum cryptosystem. The QKD is used for raw-key transmission and post-quantum crypto-system to transmit parity bits for information reconciliation. The technology can be further advanced by encoding either Slepian states-based encoding or OAM encoding. This would help overcome the low-spectral efficiency of time-phase-encoding but the complexity of the QKD hybrid system would increase. The proposed system is able to achieve a record transmission distance of 1127 km.
Background:
The need for secure communications has become essential because of the rising threat and impact of data breaches. The adoption of quantum key distribution over traditional public/private key security has improved the security of communications. However, there are still a handful of constraints of QKD. Some of these include cost, distance limitations and still under development. By implementing a system similar to this invention, the limitation of distance can be reduced and further increase the feasibility of QKD systems.
Applications:
- Raw-key transmission
- Error reconciliation
Advantages:
- Overcome rate-distance-limit of QKD protocols
- Greater transmission distances
- Addresses the problem of channel loss
