Research Scientist - Cryptography

London /
Science & Technology – Cyber & Quantum Technologies /
Cambridge Quantum (CQ) is a global leader in quantum computing.  Our software helps our partners, collaborators, and clients to solve the most difficult problems in their industries through quantum computing. Our focus is in the areas of quantum chemistry, quantum machine learning, quantum algorithms and quantum encryption.

Our cybersecurity division is developing a number of quantum-related technologies to enhance the security of our enterprise customers. This includes the world’s only quantum random number generator (QRNG) that uses quantum computers to produce perfectly unbiased entropy.

About the role
As a researcher in theoretical cryptography you will work in our quantum cryptography team, which combines expertise in different fields such as quantum information and cryptography, mathematics and experimental physics in order to develop quantum-based solutions to problems in cryptography (see [1] for a sample of our work). Our team also works closely with the optics and engineering teams for the real-world implementation and deployment of our products.
In this role you will bring your expertise in computer science and/or classical cryptography to find solutions to the different problems faced both by classical cryptography in a post-quantum world but also the ones faced by quantum cryptography. One such example is randomness extractors [2], which are both essential in quantum cryptography and also need to be made quantum-proof [3]. To thrive in this role you will be self-driven and given the freedom to learn, but you will also give direction and explore your own solutions to all these challenges.
In summary, you will:
     Research and design new cryptography applications with a quantum advantage, together with their security proofs.
     Find innovative solutions to the problems faced by classical cryptography in a quantum world and to the challenges faced in quantum cryptography.
     Develop and implement mathematical schemes and algorithms, e.g. randomness extractors, digital signatures and other cryptographic primitives.

Location: Teddington and/or central London (Currently home working within UK - flexible working available)

Key Requirements:

    • Theoretical background in computer science and/or cryptography.
    • PhD in Computer Science, Mathematics, Physics or related field (or equivalent experience).
    • Expertise in one or more of the following: post-quantum cryptography (such as lattice-based crypto), multi-party computation, zero-knowledge proofs, formal verification tools, information-theoretic security, cryptanalysis.
    • Capacity and desire to work in an interdisciplinary team.
    • Track record of publications in relevant fields.


    • Job experience in research, either as a postdoc or with a company, is beneficial but not essential.
    • Familiarity with quantum-based cryptography.
    • An interest in the discussions and issues surrounding the transition to post-quantum cryptography.
    • Good programming skills (E.g. Python, C/C++ and/or other).
    • Ability to mentor and coach colleagues.
What is in it for you?

Working alongside a highly talented team, with leading names in the quantum computing industry. We offer a highly competitive package including equity participation, 28 day’s paid annual leave, a workplace pension and a positive approach to flexible working.

About Us:
Founded in 2014, CQ operates at the very core of quantum computing and is backed by some of the world’s leading partners with strong domain expertise including IBM, Honeywell and JSR Corp. Our core focus is in quantum software and enterprise applications in the area of quantum chemistry, quantum machine learning, and quantum encryption.  With over 180 professionals, CQ has a strong and unique scientific grounding in terms of its core team with over 120 scientists, of which over 85 are Ph.D. holders. CQ has a “Science Led; Enterprise Driven” approach and built a tier one ecosystem of customers, investors, and partners including IBM, Honeywell, JSR Corp, Total, Nippon Steel, and many other Fortune 500 companies. We are in the process of expanding our operations significantly across our offices in Cambridge (U.K.), Oxford, London, Washington, DC, and Tokyo.

Quantinuum is the combination of Cambridge Quantum with Honeywell Quantum Solutions, structured to drive the future of quantum computing. By uniting best-in-class software and enabling tools with the best-performing quantum computers, we are delivering on the potential of quantum technology today. We aim to be a center of gravity for quantum computing, supporting collaboration across the ecosystem.

Science led, enterprise driven. Driven to Discover the Future

The combined company has a team of nearly 400 people. Among them you'll find the world's leading quantum computing hardware and software experts. Not only are they driven to discover the future, but they are also committed to change the world for the better.

Please note that employment with us is subject to successfully passing our pre-employment screening checks. We are an inclusive equal opportunity employer.