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TT: Fachverband Tiefe Temperaturen

TT 20: Transport: Quantum Coherence and Quantum Information Systems 3 (jointly with MA and HL)

TT 20.2: Talk

Tuesday, March 27, 2012, 10:00–10:15, BH 243

Engineering and manipulating Majorana bound states in 1D quantum wires — •Panagiotis Kotetes¹, Alexander Shnirman², and Gerd Schön¹ — ¹Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — ²Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany

Recently, the interest in topological quantum computing has grown due to the appearance of promising platforms for realizing the long sought Majorana bound states. Among the proposals that appear suitable for engineering the Majorana bound states, the most prominent involves a 1D semiconducting quantum wire in proximity to a bulk s-wave superconductor, where in addition a Zeeman magnetic field is applied. In this work, we investigate the possibility of performing qubit operations via the adiabatic variation of certain internal parameters without using any external gates or network of wires. The crucial feature of our model is the combination and interplay of phases for the magnetic field and the superconducting order parameter. In an appropriate junction setup, we explore the possible phase configurations that could lead to a Majorana bound state exchange.