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Physics Colloquium - Florian Marquardt

Friday, 14 December 2018

Physics Department
Colloquium

Florian Marquardt


Director at the Max Planck Institute for the Science of Light

Professor of Theoretical Physics

Friedrich Alexander University of Erlangen-Nuremberg


"Neural Networks Discovering Quantum Error Correction Strategies"


Machine learning with artificial neural networks is revolutionizing science. The most advanced challenges require discovering answers autonomously. In the domain of reinforcement learning, control strategies are improved according to a reward function. The power of neural-network-based reinforcement learning has been highlighted by spectacular recent successes such as playing Go, but its benefits for physics are yet to be demonstrated. Here, we show how a network-based “agent” can discover complete quantum-error-correction strategies, protecting a collection of qubits against noise. These strategies require feedback adapted to measurement outcomes. Finding them from scratch without human guidance and tailored to different hardware resources is a formidable challenge due to the combinatorially large search space. To solve this challenge, we develop two ideas: two-stage learning with teacher and student networks and a reward quantifying the capability to recover the quantum information stored in a multiqubit system. Beyond its immediate impact on quantum computation, our work more generally demonstrates the promise of neural-network-based reinforcement learning in physics.

WHEN: Friday 14 December 2018
WHERE: Room 314, Science 3 Building
TIME: 10.00am–11.00am

All interested are welcome to attend