## Quantum Computer vs Classical Computer-Difference between Quantum Computer and Classical Computer

This page compares Quantum Computer vs Classical Computer and mentions difference between Quantum Computer and Classical Computer.

Classical Computer |
Quantum Computer |
---|---|

It is large scale integrated multi-purpose computer. | It is high speed parallel computer based on quantum mechanics. |

Information storage is bit based on voltage or charge etc. | Information storage is Quantum bit based on direction of an electron spin. |

Information processing is carried out by logic gates e.g. NOT, AND, OR etc. | Information processing is carried out by Quantum logic gates. |

Circuit behaviour is governed by classical physics. | Circuit behaviour is governed explicitly by quantum mechanics. |

Classical computers use binary codes i.e. bits 0 or 1 to represent information. | Quantum computers use Qubits i.e. 0, 1 and both of them simultaneously to run machines faster. |

Operations are defined by Boolean Algebra. | Operations are defined by linear algebra over Hilbert Space and can be represented by unitary matrices with complex elements. |

No restrictions exist on copying or measuring signals | Severe restrictions exist on copying and measuring signals |

Circuits are easily implemented in fast, scalable and macroscopic technologies such as CMOS. | Circuits must use microscopic technologies that are slow, fragile and not yet scalable e.g. NMR (Nuclear magnetic resonance). |

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