Universal set of quantum gates for double-dot exchange-only spin qubits with intradot coupling. (21st January 2015)

• Record Type: Journal Article
• Authors: Michielis, M De; Ferraro, E; Fanciulli, M; Prati, E
• Is Part Of: Journal of physics. Volume 48:Number 6(2015)
• Publication Date: 2015-01-21
• Subjects: spin qubit -- quantum dots -- universal set -- quantum gates; Mathematical physics -- Periodicals; Statistical physics -- Periodicals; Quantum theory -- Periodicals; Matter -- Properties -- Periodicals; 530.105
• DOI: 10.1088/1751-8113/48/6/065304
• Languages: English
• ISSNs: 1751-8113

Abstract

Abstract: We present a universal set of quantum gate operations based on exchange-only spin qubits in a double quantum dot, where each qubit is obtained by three electrons in the (2, 1) filling. Gate operations are addressed by modulating electrostatically the tunneling barrier and the energy offset between the two dots, singly and doubly occupied respectively. We propose explicit gate sequences of single qubit operations for arbitrary rotations, and the two-qubit controlled NOT gate, to complete the universal set. The unswitchable interaction between the two electrons of the doubly occupied quantum dot is taken into account. Short gate times are obtained by employing spin density functional theory simulations.