Are You Ready to Witness the Future of Data Security?
Platform
©2025 QuNu Labs Private Limited, All Rights Reserved.
Discrete Variable QKD encodes information in distinct, separate quantum states - like the difference between whole numbers (discrete) versus decimal numbers (continuous). Typically this means single photons with polarization (vertical or horizontal, diagonal or anti-diagonal) or phase states. Bob measures each photon with single-photon detectors that either click (detected) or don't (not detected). The "discrete" isn't just technical jargon - it means the information is digital-like, either-or, which maps naturally to bits. DV-QKD includes the famous BB84 protocol and entanglement-based protocols like E91. The detectors need cooling to reduce noise (false clicks when no photon arrives), and key rates are limited by detector dead time. But DV-QKD holds the distance records - researchers have demonstrated it over 300+ kilometers and even satellite-to-ground links.
DV-QKD has the longest track record and the strongest security proofs. When governments and defense organizations deploy QKD, they typically choose DV-QKD because the security analysis is mature and well-understood. The physics is also cleaner conceptually - one photon equals one bit of information.
For maximum-distance links or highest-security requirements, DV-QKD is the standard. It's what protects classified communications, connects quantum network nodes separated by cities, and will eventually enable satellite quantum key distribution for global coverage.
Government classified networks requiring maximum distance, military communications across theater distances, international diplomatic links, satellite-to-ground quantum key distribution, quantum network backbone connections, ultra-secure banking communications
https://www.qnulabs.com/quantum-key-distribution
DV-QKD, discrete variable QKD, single-photon QKD, BB84, E91 protocol, polarization encoding, phase encoding, long-distance QKD, secure quantum communications, single-photon avalanche photodiode, SPAD, quantum network