Cryptographic Applications of Quantum Communication

In Next-generation Networks

Ericsson Hungary would like to explore how Quantum Key Distribution, a new emerging technology could benefit and serve as the backbone of a future Quantum safe network which aims to be a secure alternative to traditional key exchange methods in the presence of quantum computers. The EIT Digital Doctoral School announces thus an open position for an industrial doctorate in Budapest on this specific topic of quantum communication. Concepts will be prototyped and their operation will be analysed in real use case scenarios. A 6-month mobility at KTH in Sweden, one of the best European research institutions in this field, is also part of the program.


A new threat dangers traditional key exchange based communication methods that use factoring or discrete logarithm as the underlying hard problem (RSA, DH,…). Quantum computer algorithms can solve these hard problems in polynomial time, whereas traditional computers will never be able to tackle them since just increasing the key size to a sufficient level puts these hard problems out of range for classical computing, so previously it was thought to be ultimately secure.

As traditional communication can be recorded, secrets transmitted today are in danger as a quantum computer will be able to decipher all encrypted data in the future. Quantum key distribution (QKD) relies on quantum mechanics and it can not be recorded thanks to the no cloning theorem and QKD protocols are provably secure against an adversary with infinite computing power. However, the technology still has challenges in terms of scalability, performance and ideal realisation. The aim of this thesis is to enhance QKD protocols and solve related challenges.


In the first step an in depth study of the state of the art technology and the latest results is necessary, which should be followed by studying prototypes in comprehensive simulation scenarios and potentially in real networks. The solutions should achieve compatibility with the current network to minimize additional modification costs end enable deployability.

Expected outcome

The expected results of the PhD are new enhancements to QKD systems and solutions for existing problems to enable integration into Next-generation networks and thus improve security, performance and efficiency. The results shall include a working and verified prototype of the new concepts, a detailed analysis of their impact on network performance, and deployment considerations. The results should be published in high-quality academic journals, but potential patents should be also investigated, in close cooperation with Ericsson Hungary.


The doctoral student involved in this program will share its time between the Co-Location Center of the EIT Digital Budapest Node, the premises of Ericsson Hungary, and the Budapest university of Technology and Economics. A 6-month mobility to KTH in Sweden, one of the best known European research groups in this field, will be also part of the program.


  • Industrial partner: Ericsson Hungary Ltd.
  • Academic/research partner: Budapest University of Technology and Economics
  • Number of available PhD positions: 1 
  • Duration: 4 years
  • This PhD will be funded by EIT Digital, Budapest University of Technology and Economics, and Ericsson Hungary Ltd.


Those interested in applying should send an e-mail to, including a CV, a motivation letter, and documents showing their academic track records. Please apply before April 20, 2018.