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Q: Fachverband Quantenoptik und Photonik
Q 1: Quantum Information: Concepts and Methods I
Q 1.6: Talk
Monday, March 6, 2017, 16:15–16:30, P 2
Recovering the ideal results of a perturbed analog quantum simulator — •Iris Schwenk1, Jan-Michael Reiner1, Sebastian Zanker1, Lin Tian2, Juha Leppäkangas1, and Michael Marthaler1 — 1Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 2School of Natural Sciences, University of California, Merced, California 95343, USA
Well controlled quantum systems can potentially be used as quantum simulators. However inevitably a quantum simulator is perturbed by coupling to additional degrees of freedom. This constitutes a major roadblock to useful quantum simulations, since so far there are only a limited amount of possibilities to understand the effects of these perturbation on the result of the quantum simulation. We present a method which in limited circumstances, allows for the reconstruction of the ideal result from measurements on a perturbed quantum simulator. We study the case where we are interested in extracting a correlator ⟨Ôi(t) Ôj(0)⟩ from the simulated system in equilibrium, where Ôi are the operators which couple the system to its environment. The ideal correlator can be reconstructed if any n-time correlator of operators Ôi of the ideal system can be written as products of two-time correlators. We give an approach to verify the validity of this assumption experimentally using additional measurements on the perturbed quantum simulator.