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# Quantum Mechanical Model of the Atom

## More exact than the Bohr Model, this model represents atomic energy levels with complex shapes.

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Quantum Computers

### Quantum Computers

Credit: D-Wave Systems, Inc.. Original uploader was Ndickson
Source: http://en.wikipedia.org/wiki/File:DWave_128chip.jpg

By using an electron-beam ion trap, Thomas Schenkel and T.C. Shen of the Accelerator and Fusion Research Division are trying to develop a quantum computer that uses single electrons as transistors.

#### Amazing But True

• To show how powerful a quantum computer is in comparison to a regular computer, we have to compare bits to qubits (quantum bits). If a classical computer has a 3 bits, it can have one of the 8 following possible states: 000, 001, 010, 100, 011, 101, 110, 111. A quantum computer on the other hand can be in all of the above possible states at the same time. This implies that the number of possible states for a qubit is 2N, where N is the number of qubits. Therefore, if a quantum computer that is made of 50 qubits is made, the number of possible states is greater than 10 15 states.
• Learn about the advancements of Quantum Computers and Moore's Law below:

#### Explore More

Using the information provided above, answer the following questions.

1. If you had 3 qubits, how many possible states could you have at once if each bit itself could be 1 or 0?
2. What is Moore's Law and why is it important?
3. What is quantum superposition of states?

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