Quantum logic gate is a circuit, which performs a fixed unitary operation on selected qubits in a fixed period of time. The aim of this paper is to propose a simulator - Quantum Circuit Simulator (QCS) that simulates the quantum logic gates. This is a hardware-based simulator. Normally the quantum computers use Quantum gates, which perform the arithmetic operations by means of Quantum Arithmetic and Logic Unit (QALU), which is similar to ALU in Conventional computers. This paper presents the structure of Quantum gates and their simulation result along with their run time calculation.