2005年 電子情報通信学会総合大会
D-1-4

Design of Dual-Rail CNOT Gate

足立進
フェルディナンドペパー
李佳
Susumu Adachi
Ferdinand Peper
Jia Lee
情報通信研究機関関西先端研究センター
National Institute of Information and Communications Technology


1 Introduction


 A qubit, the basic element of a quantum computer, is a two-level system for which many physical realizations have been proposed, such as silicon-based nuclear spins [1], excitons in quantum dots [2], etc. To construct quantum circuits, some qubits should be coupled as a quantum gate. A control NOT (CNOT) is a typical quantum gate operating on two qubits, a control bit and a target bit [3] It is important to find efficient ways to implement it physically. We propose a design of the CNOT gate with coupled quantum dot molecules in 3-dimensional structure. The gate employs dual-rail encoding to represent its input and output qubits, which corresponds with four input and four output lines. It is driven by oherent transports (or resonant tunnelings) through the dots and by Coulomb interaction between them.