Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 89: Focus Session: Quantum Information Systems (jointly with MA,TT)
HL 89.1: Vortrag
Donnerstag, 29. März 2012, 16:45–17:00, ER 164
Non-local coupling between spin qubits via a transmission line shuttle — •Peiqing Jin1, Michael Marthaler1, Alexander Shnirman2,3, and Gerd Schön1,3 — 1Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — 2Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — 3DFG Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
Quantum dots with long lived spin states are promising systems for qubit realizations [1]. Coherent single qubit manipulations have been demonstrated in such systems. However, generating a non-local qubit-qubit interaction, which is crucial for the scalability of quantum computation, is still challenging. Stimulated by recent progresses in circuit quantum electrodynamics setups [2], we propose a mechanism of coupling distant spin qubits formed in double quantum dots via a superconducting transmission line resonator. A strong qubit-resonator interaction arises based on the exchange splitting between the singlet and triplet states. The mechanism allows the system to be operated at the charge degeneracy point where the dephasing is minimized. Remarkably, due to a finite longitudinal qubit-resonator coupling, a strong blue-sideband transition is accessible as a first order process, which favors a fast generation of an entangled qubit pair.