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# Quantum computing

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this is a ppt on quantum computing...done by students of Gudlavalleru engg college,Andhrapradesh...revanth

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### Quantum computing

1. 1. Quantum computationBased on nanotechnology By: M.Revanth kumar T.Sri kanth
2. 2. Speed of computation:  Vaccum tubes  Transistors  Devices that perform quantum computing
3. 3. Quantum mechanicsPhysical phenomena at microscopic scalesCompletely different from classical mechanics
4. 4. Quantum computing Theoretical study of quantum systems Those systems are applied to make a quantum computer Uses “QUBITS”
5. 5. Bits (classical computing) A bit can exist only in one state Either 0 or 1 Information behaviour : one single direction Logic gates are irreversible
6. 6. Qubits Can exist as 0 or 1 or coherent superposition of both Operation on a qubit effectively acts on both values at a same time An exist in both values simultaneously
7. 7. Bloch’s sphere: |1> |0>
8. 8. Ket notation: q= a l0> + b l1> Qubit system No. of (n) operations 2 4 3 8 4 16
9. 9. Representation of Data -Qubits Light pulse of frequency  for time interval t |0> |1>
10. 10. Physical interpretation Light pulse of frequency  for time interval t/2 State |0> State |0> + |1>
11. 11. Representation of Data -Superposition  A single qubit can be forced into a superposition of the two states denoted by the addition of the state vectors: |> =  |0> +  |1>  Where  and  are complex numbers and | | + | | =1
12. 12. Processors Classical processors Quantum processorsEach processor perform Single processor can one computation,while perform multiple other processors do computations on its own other computations simultaneously
13. 13. As increase in no.of Qubits Increase in quantum parallelism SolveQuantum parallelism problems in + fraction of Algorithm time
14. 14. GATES:Can achieve reversible operations by using quantumgatesEx.The AND Gate A B C 0 0 0 0 1 0 1 0 0 1 1 1
15. 15. Reversible operations For a computer to run fast Inputs can be correctly deduced from outputs Irreversible computation involve loss of information
16. 16. Taffoli gate:It’s a reversible gate
17. 17. Quantum Gates - Hadamard Simplest gate involves one qubit and is called a Hadamard Gate (also known as a square-root of NOT gate.) Used to put qubits into superposition. H H State State State |0> |0> + |1> |1> Note: Two Hadamard gates used in succession can be used as a NOT gate
18. 18. Quantum computer Use direct use of quantum mechanical phenomena Utilizes quantum properties to represent data Could solve certain problems much faster
19. 19. Shor’s algorithm Allows extremely quick factoring To factor a 1000 digit number For a classical computer it take 10 million billion years For a quantum computer its just 20 min
20. 20. Building a quantum computer It can’t be from transistor and diodes A new type of technology is needed A technology that enables qubits to exist as coherent superposition of 0 and 1
21. 21. Why Nanotechnology is applied?
22. 22. References Text books: 1. Palanisamy 2. A quantum revolution for computing. Julian Brown, New Scientist 24/9/94 Wikipedia.org Videos on quantum computation by “centre for quantum computation and communication technology”
23. 23. Queries ?
24. 24. What ever may be the technology wecome up with, should able to reach a common man.