Archimedeans Talk: Quantum Money without Quantum Memory: Unforgeable Currency in Theory and Practice

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• Prof. Adrian Kent, DAMTP
• Friday 21 March 2025, 18:00-19:00
• Center for Mathematical Sciences, Lecture room MR2.

If you have a question about this talk, please contact Daniel Nguyen.

Quantum money was one of the first inventions in quantum information technology. The idea is to make money tokens by including some stored quantum states, whose description the bank knows but users do not. Intuitively, these tokens should be unforgeable because the quantum no-cloning theorem tells us that there is no possible way of constructing a device that will duplicate unknown quantum states. As I will explain, though, proving this intuition takes rather more work. Quantum money is not currently practical, because we have no long-term quantum memories. However, I will describe a recently proposed way of emulating its advantages without quantum memories, and an experimental demonstration. Interestingly, this involves re-examining what the advantages of quantum money actually are, which requires re-thinking the role of money in space and time.

This talk is part of the Archimedeans Talks LT25 series.

This talk is included in these lists:

• Archimedeans Talks LT25
• Center for Mathematical Sciences, Lecture room MR2

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