title: Fast hybrid silicon double-quantum-dot qubit.
abstract: We propose a quantum dot qubit architecture that has an attractive combination of speed and fabrication simplicity. It consists of a double quantum dot with one electron in one dot and two electrons in the other. The qubit itself is a set of two states with total spin quantum numbers S(2)=3/4 (S=1/2) and S(z)=-1/2, with the two different states being singlet and triplet in the doubly occupied dot. Gate operations can be implemented electrically and the qubit is highly tunable, enabling fast implementation of one- and two-qubit gates in a simpler geometry and with fewer operations than in other proposed quantum dot qubit architectures with fast operations. Moreover, the system has potentially long decoherence times. These are all extremely attractive properties for use in quantum information processing devices.
authors.affiliation: Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
authors.forename: Zhan
authors.initials: Z
authors.lastname: Shi
authors.forename: C B
authors.initials: CB
authors.lastname: Simmons
authors.forename: J R
authors.initials: JR
authors.lastname: Prance
authors.forename: John King
authors.initials: JK
authors.lastname: Gamble
authors.forename: Teck Seng
authors.initials: TS
authors.lastname: Koh
authors.forename: Yun-Pil
authors.initials: YP
authors.lastname: Shim
authors.forename: Xuedong
authors.initials: X
authors.lastname: Hu
authors.forename: D E
authors.initials: DE
authors.lastname: Savage
authors.forename: M G
authors.initials: MG
authors.lastname: Lagally
authors.forename: M A
authors.initials: MA
authors.lastname: Eriksson
authors.forename: Mark
authors.initials: M
authors.lastname: Friesen
authors.forename: S N
authors.initials: SN
authors.lastname: Coppersmith