Rostock 2019 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
Q: Fachverband Quantenoptik und Photonik
Q 4: Quantum Gases (Bosons) I
Q 4.7: Talk
Monday, March 11, 2019, 12:15–12:30, S HS 037 Informatik
Measuring Dynamical Properties of Quantum Many-Body Systems Using Engineered Dissipation — •Kevin Geier1,2 and Philipp Hauke1,2 — 1Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany — 2Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany
Dynamic correlation functions of observables at unequal times encode many fundamental properties of quantum many-body systems such as transport coefficients or excitation spectra. However, an experimental measurement of such correlations is challenging due to the quantum mechanical collapse of the wave function. We propose a novel, general technique of probing correlations in a system by coupling to an ancilla system exposed to classical noise. In the limit of large noise, back action from the ancilla on the system is minimized owed to a quantum Zeno effect, while the dissipative dynamics gives access to a hierarchy of correlation functions. We demonstrate the scheme for the measurement of current-current correlations in bosonic lattice systems by means of numerical simulations. Possible applications of the technique include the study of thermalization in quantum many-body systems far from equilibrium by experimentally testing fluctuation-dissipation relations.