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Quantum Computer

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Quantum Computer Speaker: Outline Introduction of Quantum computer Implement of Quantum computer Application of Quantum computer Challenge of Quantum ... – PowerPoint PPT presentation

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Title: Quantum Computer


1

Quantum Computer
Speaker ???
2
Outline
  • Introduction of Quantum computer
  • Implement of Quantum computer
  • Application of Quantum computer
  • Challenge of Quantum computer
  • Nowadays research of Quantum computer

3
Moores Law
Will the Moores Law be correct in the future ???
4
Possible Solution Quantum Computer
5
Superposition principle
  • dual particle-wave behavior
  • ?Only kwon where the particle is
  • likely to be found
  • Superposition principle
  • ?a particle can also exist at two
  • places at once

6
Quantum Mechanics
  • n-level system
  • any state?
  • ?amplitude
  • ?orthonormal
    basis
  • EX 2-level,choice basis
  • possible state

7
Bits and Qubits
  • Bit high/low voltage ? 1/0
  • One state ? either 1 or 0
  • represent one state at one time
  • EX300 bits represent one state at one time
  • Qubit exist or not in Orbit ? 1/0
  • One state ? possibly 1 or 0
  • represent several state at one time
  • EX300 qubits represent at one time

8
Detail in Qubit
Two qubits system
State
State
State
1 0
0 1
0 0/0 1/1 0/1 1
Superposition states
9
Quantum Parallelism
  • Qubit Superposition of the 0 and 1
  • Use different superposition state
  • ?Compute simultaneously
  • ?have fantastic power in some problem

10
Shor's factoring algorithm
  • use conventional algorithm
  • factor a number N in O ( )
  • use Quantum Parallelism
  • factor a number N in O ( )
  • factor the number in 400 bits
  • Super computer
  • ?take one billion years
  • Quantum computer(1000qubits)
  • ?only take few hours

11
Outline
  • Implement of Quantum computer

12
Qubit System
  • Qubit System
  • ?exhibit quantum phenomena
  • for quantum computing
  • control quantum state
  • Measure the state of qubit
  • Quantum error correction

13
Hardware Implement-1
  • Quantum Dot

semiconductor materials
Confine single electron in discrete energy
level
Control by Laser
1 qubit solid-state device (about 30nm)
14
In 1999, Japan
  • ??????,????

?????????superposition state
??0???
??1???
Quantum dot ??????
15
Hardware Implement-2
  • Ion traps

4 rod electrodes AC 1kv MHz trap the ions
End-rings Charged to prevent escaping
ions
Ion trap
16
Stanford and IBM
  • First demonstration (in 2001)
  • Shor's factoring algorithm
  • 7 qubits system
  • to find the factor of 15
  • System? tube including molecule that has 7
    nuclear spins

17
7 Nuclear Spins
  • programmed by radio frequency pulses
  • detected by NMR
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