A Witness for Quantum Correlations Using Nonlinear Spectroscopy

arXiv:2611.11021v1 Announce Type: new Abstract: The ability to detect and quantify entanglement in molecular systems is essential for understanding their quantum correlations and to evaluating molecules as platforms for quantum technologies. Here we show how signals from existing spectroscopic techniques can provide sufficient information to witness entanglement. The main ingredient is a spectroscopic map from admissible quantum states to a finite-dimensional space of signal coefficients, which are expectation values of state-independent effective observables.