Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 24: Quantum Information (Solid State Systems)
Q 24.5: Vortrag
Montag, 5. März 2018, 17:15–17:30, K 1.020
Measurement controlled quantum state engineering of a spin environment — •Durga Dasari1,2, Stefan Jesenski1, Johannes Greiner1, Florian Kaiser1, Sen Yang3, and Joerg Wrachtrup1,2 — 1University of Stuttgart, Stuttgart, Germany — 2Max Planck Institute for Solid State Research, Stuttgart, Germany — 3The Chinese University of Hong Kong, Hong Kong
Quantum systems are inevitably coupled to their surrounding environment and are never completely isolated. Controlling such systems through measurements not only affects the system of interest but also its surroundings i.e, environment influences the measurement result and in turn the measurement influences the environment. This kind of back-to-back action adds new feature in steering the evolution of quantum baths through quantum measurements.
We explore this phenomena both theoretically and experimentally using solid state defect centers in diamond. Our studies indicate that there exists an optimal state of the environment which protects the coherence of the quantum system coupled to it and the statistics of the measurement results that lead to such engineered state follow Quantum Random Walk behavior. We will further show application of such measurement-controlled bath engineering towards machine learning and solving certain classical (NP-)hard problems.