SKM 2021 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 3: Focus Session: Entanglement as a Probe for Correlated Quantum Matter

TT 3.1: Talk

Monday, September 27, 2021, 13:30–14:00, H6

Measuring quantum entanglement with neutrons — •Alan Tennant — Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

The quantification of entanglement without the need for underlying models and theoretical solutions is an open challenge for measurement in condensed matter. This is particularly important in the case of quantum magnets such as spin liquids where we often lack theories that can connect with measurement. Three quantum entanglement witnesses relevant to neutron scattering have been proposed in the form of one-tangle, two-tangle (concurrence), and quantum Fisher information. We have recently applied these to real quantum magnets and found the one-tangle and quantum Fisher information to be particularly promising. I will show how the entanglement witnesses can be determined using experiment and what can be learned from them about the underlying quantum states.