Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 16: Electron spin qubits in semiconductor quantum dots (Focus session with TT)

HL 16.5: Talk

Monday, March 31, 2014, 16:30–16:45, POT 051

Combining spin and valley singlet-triplet qubits for universal quantum computing — •Niklas Rohling, Maximilian Russ, and Guido Burkard — Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

The valley degree of freedom in silicon or other materials is often considered to be an obstacle for quantum computing based on electron spins in quantum dots. Nevertheless, controlling the valley states opens new possibilities for quantum information processing. Combining qubits encoded in the single-triplet subspace of spin and of valley states allows for universal quantum computing because the exchange interaction directly provides a universal two-qubit gate between those qubits if they are stored in the same two-electron double quantum dot [1]. We show how spin and valley qubits can be separated in order to enable single-qubit rotations. Finally we propose explicit sequences for quantum gates in two kinds of spin-valley quantum registers.

[1] N. Rohling and G. Burkard, New Journal of Physics 14, 083008 (2012).