Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 4: Matter Wave Optics I
Q 4.6: Talk
Monday, March 5, 2018, 11:45–12:00, K 1.013
Controlling the directionality and the quantum-to-classical transition of a quantum walk in momentum space — •Alexander Gresch1, Siamak Dadras2, Caspar Groiseau1, Gil S. Summy2, and Sandro Wimberger3,4,1 — 1ITP, Heidelberg University, Philosophenweg 12, 69120 Heidelberg, Germany — 2Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078-3072, USA — 3Dipartimento di Scienze Matematiche, Fisiche ed Informatiche, Università di Parma, Parco Area delle Scienze 7/A, 43124 Parma, Italy — 4INFN, Sezione di Milano Bicocca, Gruppo Collegato di Parma, Parma, Italy
Randomness is the crucial characteristics in a huge variety of phenomena ranging from Brownian motion to game theory. Its quantum counterpart might play a key role in quantum computation algorithms as it intrinsically differs due to its quantum features: interference and entanglement. Both resources are featured in quantum walks. They use entanglement to determine the walker’s direction of motion. Several proof-of-principle experiments have already been conducted for quantum walks, our walk scheme, however, features robustness and controllability as they stem from the synthesis of the well-studied atom-optics kicked rotor with a quantum ratchet for the ballistic states dynamics. Our quantum walk is realized in momentum space using a BEC. This very feature guarantees controllability and possibly an expansion to higher walk dimensions and to investigations of many-body correlations.