This Week's Seminar

Thursday, July. 12, 4:30 pm, 8325 Wean Hall, CMU

Coffee at 4:00pm at WeH 7423

Andrew Daley (University of Pittsburgh)

Measuring Entanglement During Dynamics in an Analogue Quantum Simulator

Abstract

An important goal in quantum computing in general is to demonstrate situations where a quantum device can make computations that are more efficient than the best available classical device. Perhaps the most likely candidate for such a demonstration in the near future are analogue or digital quantum simulators, which can be used to investigate dynamics in quantum many-body systems. The best available classical simulations of these dynamics rely on the entanglement in the system being relatively weak, and their efficiency can be quantified based on the amount of spatial entanglement in a many-body system. In this sense, the amount of many-body entanglement underlies the complexity of simulating quantum physics on a classical computer. While much progress has been made in developing analogue and digital quantum simulators, an outstanding challenge is direct measurement of the (potentially large scale) entanglement, and monitoring entanglement growth in non-equilibrium dynamics. We address these questions by discussing measurement scenarios for entanglement entropies, using multiple copies of a quantum system and measurements that are available in current experiments with a quantum gas microscope. I will give an overview of these ideas, and discuss potential applications towards the demonstration of the power of a quantum simulator.