Physics – Quantum Physics
Scientific paper
2011-09-15
Physics
Quantum Physics
accepted for publication, in press Phys.Rev.Lett. 2011
Scientific paper
A crucial requirement for quantum information processing is the realization of multiple-qubit quantum gates. Here, we demonstrate an electron spin based all-electrical two-qubit gate consisting of single spin rotations and inter-dot spin exchange in a double quantum dot. A partially entangled output state is obtained by the application of the two-qubit gate to an initial, uncorrelated state. We find that the degree of entanglement is controllable by the exchange operation time. The approach represents a key step towards the realization of universal multiple qubit gates.
Brunner Robert
Kubo Takayuki
Obata Toshiaki
Pioro-Ladriere Michel
Shin Young Su
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