title: Tunable capacitive coupling between two semiconductor charge qubits.
abstract: Strong coupling between two qubits is one of the main requirements for high fidelity two-qubit logic operations. Here we experimentally investigate the capacitive coupling between two double quantum dots. A pair of open slot confinement gates is used to enhance the coupling. We find that the coupling energy J can be conveniently tuned in a broad range. Through numerical simulations, we study the effect of J on two-qubit operations. The analysis shows that our experimentally obtained J is adequate to achieve high fidelity two-qubit entanglement and logic gates.
authors.affiliation: Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China. Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
authors.forename: Guo-Dong
authors.initials: GD
authors.lastname: Yu
authors.forename: Hai-Ou
authors.initials: HO
authors.lastname: Li
authors.forename: Gang
authors.initials: G
authors.lastname: Cao
authors.forename: Ming
authors.initials: M
authors.lastname: Xiao
authors.forename: Hong-Wen
authors.initials: HW
authors.lastname: Jiang
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Guo