# Advances in Quantum Cryptography

**Authors:** S. Pirandola, U. L. Andersen, L. Banchi, M. Berta, D. Bunandar, R. Colbeck, D. Englund, T. Gehring, C. Lupo, C. Ottaviani, J. Pereira, M. Razavi, J. S. Shaari, M. Tomamichel, V. C. Usenko, G. Vallone, P. Villoresi, P. Wallden  
**arXiv:** [1906.01645](https://arxiv.org/abs/1906.01645)  
**Date:** 2019-06-04  
**Summary page:** https://www.summarizepaper.com/en/arxiv-id/1906.01645v1/

## Key points

- Quantum cryptography is rapidly evolving with novel theoretical protocols and improved security proofs.
- Advancements are being made in both theory and practice, transitioning from lab demonstrations to real-world implementations.
- Recent advances cover a wide range of topics including quantum key distribution, device independence, satellite challenges, and high-rate protocols.
- Cutting-edge technologies aim to address limitations of traditional cryptographic methods for secure communication over long distances.
- Quantum repeaters and networks are explored to overcome constraints in point-to-point private communications.
- Researchers leverage quantum entanglement and other phenomena to push the boundaries of secure communication protocols.
- Emerging trends include quantum data locking and quantum digital signatures for securing data transmission and authentication in a quantum world.

## Summary

The rapidly evolving field of quantum cryptography is continuously developing novel theoretical protocols and improving security proofs to enhance the security of communication systems. With experiments transitioning from lab demonstrations to real-world implementations and technological prototypes, significant advancements are being made both in theory and practice. This review article provides a comprehensive overview of recent advances in quantum cryptography, covering a wide range of topics. The discussion begins with an exploration of protocols for quantum key distribution based on discrete variable systems, highlighting the importance of secure key exchange in quantum communication. The review then delves into more advanced concepts such as device independence, satellite challenges, and high-rate protocols utilizing continuous variable systems. These cutting-edge technologies aim to address the limitations of traditional cryptographic methods and pave the way for secure communication over long distances. Furthermore, the article examines the ultimate limits of point-to-point private communications and explores how quantum repeaters and networks can potentially overcome these constraints. By leveraging quantum entanglement and other quantum phenomena, researchers are pushing the boundaries of secure communication protocols. Finally, the review discusses emerging trends in quantum cryptography beyond standard key distribution techniques. Topics such as quantum data locking and quantum digital signatures offer new avenues for securing data transmission and authentication in a quantum world. Overall, this comprehensive review provides valuable insights into the latest developments in quantum cryptography, highlighting ongoing efforts to revolutionize secure communication through harnessing the power of quantum mechanics.