COMPUTER SIMULATION OF THE WORKING CYCLE OF A QUANTUM CONTROLLED-NOT GATE WITH TWO COUPLED QUANTUM DOTS

Abstract

We discuss a possible realization of a quantum controlled-NOT gate with the use of two coupled quantum dots. Transitions between quantum states of a computational basis are driven by the microwave π-pulse. The parameters of the proposed nanodevice have been optimized in order to make the operation cycle of the gate as short as possible. Numerical solutions of the time-dependent Schr¨odinger equation allow us to simulate transitions between the quantum states which correspond to the subsequent stages of the gate’s operation. The performed time-dependent simulations are a test of realizability of the quantum controlled-NOT gate in the nanodevice.

Keywords

• semiconductor quantum dot
• quantum gate operation
• controlled-NOT (CNOT) gate