Todays computers process and execute all data with use of only two states 1 or 0. But a system working on principals of Quantum Physics has three quantum states either 1 or 0, or a superposition of 0 and 1. They encode information as quantum bits or qubits. Since quantum processes are governed by Heisenberg's Uncertainity Principle, a qubit can be present at many positions at any given time. This superpositioning ability of qubits will give quantum computers a property of parallelism. As a result, a quantum computer can work on millions of computations at once unlike the desktop PC that works on one.
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