Catching photons for the future of computing

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Presentation transcript:

Catching photons for the future of computing Josh Nunn Centre for Photonics and Photonic Materials

Processing information

Computing

Bits made of atoms

Quantum bits bit qubit Two points A whole continuum of states…

Applications… 1994: Efficient factoring breaks public-key cryptography

Applications… Search Linear systems Simulation Machine learning

Which platform?

Which platform?

Which platform?

Which platform?

Which platform? Trapped ions… K donors in silicon… Superconducting circuits… Colour centres in diamond…

Some big players… Needs to be very cold!

Integrated photonics Southampton, Oxford, Bristol… UK is leading… Room temperature!

Logic gates? Photons don’t interact with each other! Logic via interference + measurement

Logic gates? Why can’t I buy an optical quantum computer yet? Probabilistic measurements = scaling catastrophe! 1 in 10 1 in 1000… 1 in 100

Multiplexing needed Why can’t I buy an optical quantum computer yet? Probabilistic measurements = scaling catastrophe! 1 in 10 1 in 1000… 1 in 100 Synchronisation needed

Our solution: Atomic ensemble Raman absorption is reversible!

Towards a compact device… Fibre technology from Bath!

Next steps at the CPPM… Carlo Page John Price Pete Mosley

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