Brunner R, Shin YS, Obata T, Pioro-Ladrière M, Kubo T, Yoshida K, Taniyama T, Tokura Y, Tarucha S. Two-qubit gate of combined single-spin rotation and interdot spin exchange in a double quantum dot.
PHYSICAL REVIEW LETTERS 2011;
107:146801. [PMID:
22107226 DOI:
10.1103/physrevlett.107.146801]
[Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2011] [Indexed: 05/31/2023]
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.
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