Implementing controlled-NOT gate based on free spin qubits with semiconductor quantum-dot arrayYin-Zhong Wu1 and Wei-Min Zhang2
1 Department of Physics, Changshu Institute of Technology - Changshu 215500, PRC
2 Center for Quantum Information Science, National Cheng Kung University Tainan 70101, Taiwan
received 10 February 2005; accepted in final form 17 June 2005
published online 13 July 2005
Based on electron spins in semiconductor quantum dots as qubits, a new quantum controlled-NOT (CNOT) gate is constructed in solid nanostructure without resorting to spin-spin interactions. Single-electron tunneling technology and coherent quantum-dot cellular-automaton architecture are used to generate an ancillary charge entangled state. Using the ancillary charge entangled state as an intermediate state, we obtain a spin entangled state and design a CNOT gate by using only single-spin rotations.
03.67.Lx - Quantum computation.
73.63.-b - Electronic transport in nanoscale materials and structures.
© EDP Sciences 2005