title: Two-qubit gate of combined single-spin rotation and interdot spin exchange in a double quantum dot.
abstract: 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 interdot 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.
authors: Quantum Spin Information Project, ICORP, Japan Science and Technology Agency, Atsugi-shi, Kanagawa, 243-0198, Japan. roland.brunner@unileoben.ac.at
authors: R
authors: R
authors: Brunner
authors: Y-S
authors: YS
authors: Shin
authors: T
authors: T
authors: Obata
authors: M
authors: M
authors: Pioro-Ladrière
authors: T
authors: T
authors: Kubo
authors: K
authors: K
authors: Yoshida
authors: T
authors: T
authors: Taniyama
authors: Y
authors: Y
authors: Tokura
authors: S
authors: S
authors: Tarucha