Quantum Computer is system that based on qubits or superpoistion to perform operation on data. After this technology a large scale of data processing will be done more fastly. Quantum Computing has the ability to perform more operation in parallel. That enhance the ability of computer. The first company that launch this computer is D wave in May 2011.
Working:
These are different from the conventional computers. That stores the data in bits that is either 0 or 1. In other words on or off position, whereas the quantum computers store or process data in qubits that contain superposition or say both positions at the same time. Comparision between Conventional computers and Quantum computers is shown in figure.
To understand quantum Computers please visit this video. It help you to understand this technology.
