What is a Quantum Computer

It's a computer that has trouble telling if Mr. Schrodinger has one cat or two.

A quantumquantumquantum computer is any device that exploits quantumquantumquantum mechanical phenomena to run algorithms. Because quantumquantumquantum computers have fundamentally different computational properties than conventional computers, data held in quantumquantumquantum computers is referred to as qubits rather than bits. In conventional computers data is represented by microscopic grooves on aaa hard disk. In aaa quantumquantumquantum computercomputercomputer, data is represented by the quantumquantumquantum properties of aaa given molecule or set of molecules.

Instead of performing computations by retrieving data from aaa hard disk and processing it using an integrated circuit filled with logic gates, quantumquantumquantum computers process data by bombarding the information-containing molecule with short pulses of radiation. Each bombardment cycle represents an algorithmic operation on the data contained within the molecule. When the algorithm terminates, the quantumquantumquantum state of the molecule is measured, aaa process which itself biases the end result. This is due to the fundamentally uncertain nature of quantumquantumquantum mechanics.

Hopefuly i helped you.

A quantum computer is any device that exploits quantum mechanical phenomena to run algorithms. Because quantum computers have fundamentally different computational properties than conventional computers, data held in quantum computers is referred to as qubits rather than bits. In conventional computers data is represented by microscopic grooves on a hard disk. In a quantum computer, data is represented by the quantum properties of a given molecule or set of molecules.

http://www.wisegeek.com/what-is-a-quantum-computer.htm
http://www.doc.ic.ac.uk/~ids/quantum_computing.html
http://www.physorg.com/news11087.html

Quantum computer --> quantum computing relies on quantum physics by taking advantage of certain quantum physics properties of atoms or nuclei that allow them to work together as quantum bits, or qubits, to be the computer's processor and memory. By interacting with each other while being isolated from the external environment, qubits can perform certain calculations exponentially faster than conventional computers

they say it goes into an aquarium and lasts 2 seconds,if they radiate it, they disturb it, so the molecule is the old idea, don't know the new way

So to sum it up:

It's a highly experimental technology, still in it's earlier stages.

If someday we find an easy and cheap way to control the atoms, these computers will have an IMMENSE amount of power, and this will make today's computers look like a joke.

Also, programming as we know it, will totally change since the very way the processors work would change.

It's based on the concept of duality and powered by half electron spin of such concept.

Quantum computing like quantum physics are theories derived from the study of quantum phenomena.

At its core, quantum computing hopes to exploit the properties of quantum dynamics to allow computers to be based on the attributes of quantum particles such as atoms instead of semi conductors like silicon and germanium.

Properties of quantum based computing include:
1. Instantaneous processing
2. Dynamic component evolution
3. End of the world

A quantum computer is a device for computation that makes direct use of quantum mechanical phenomena, such as superposition and entanglement, to perform operations on data. The basic principle of quantum computation is that quantum properties can be used to represent data and perform operations on these data...Wikipedia.org