Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 45: Mechanical, Macroscopic, and Continuous-variable Quantum Systems (joint session QI/Q)

Q 45.3: Talk

Wednesday, March 12, 2025, 15:15–15:30, HS IX

How non-classical is a quantum state? — •Martina Jung and Martin Gärttner — Friedrich-Schiller-Universität Jena, Germany

Non-classicality, defined in the sense of quantum optics, is a resource: If a non-classical state is superimposed with vacuum in a beamsplitter, the resulting state will be entangled. Hence, quantifying the non-classicality of a quantum state is crucial to gauge its potential for quantum advantage - for instance in a Boson Sampler. However, conventional non-classicality measures often fail as a practical tool in experimental setups.

Here, we implement a data-driven, devise-specific approach which quantifies the non-classicality of a state by the ability of a neural network to distinguish the state from a classical one. In this approach, snapshots from photon-number measurements are input to a permutation invariant Vision Transformer. By studying the model's attention map, our goal is to identify signatures of non-classical states that might uncover yet unknown non-classicality witnesses.

Keywords: Nonclassicality; Machine Learning; Neural Network; Quantum Optics; Resource theory