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Integrated electronic optical switches in future chip ion trap . Shu, Gang 5/24/2006. Basic concepts of Quantum Computer Ion trap technology Optical Switches in future traps Conclusions. Basic concepts of Quantum Computer Ion trap technology Optical Switches in future traps Conclusions.

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Integrated electronic optical switches in future chip ion trap

Shu, Gang

5/24/2006


  • Basic concepts of Quantum Computer

  • Ion trap technology

  • Optical Switches in future traps

  • Conclusions


  • Basic concepts of Quantum Computer

  • Ion trap technology

  • Optical Switches in future traps

  • Conclusions


A quantum computer is any device for computation that makes direct use of distinctively quantum mechanical phenomena, such as superposition and entanglement, to perform operations on data.


A computer architecture must include two fundamental elements:

A mathematics system that can represent and solve general problems.

A physical system that can realize the mathematics system.

Classical computers are based on real space and realized by macro physics laws (electronics)

Quantum computers are based on functional spaces and realized by quantum mechanics.

Quantum computers supply a new way to express and attack hard problems.

Any other ways? QFT?

Well, any realizable system described by a special mathematics may be a choice.


Why QC?

1. We’re approaching the limit of classical chip. The linear increasing computation ability will never catch up with nonlinear increasing complexity.

So, what?

Quantum Algorithms and QC

2. Physicists never forget physics:

We want to study complicated quantum system, why not simulate it with a quantum device?

3. If QC is only a dream, maybe Quantum Algorithms will shine light to some hard problems.


Does it work?

No universal algorithm yet 

BUT

some very promising ones such as Shor’s factoring algorithm

which will cause trouble to traditional information security and push people to Quantum information…


QC’s secret

Q bit

A state vector carrying all information and our hope.


  • Basic concepts of Quantum Computer

  • Ion trap technology

  • Optical Switches in future traps

  • Conclusions


Why Ion traps?

Need a quantum system well isolated from environment

Need some interactions turned on and off as wish

Trapped single ions are isolated from each other

Lasers are nice and controllable, to cool and operate the ions


What is a Paul trap?

Use rotating hyperbolic electric field to form a pseudo potential well to trap a ion, and use laser to cool the ion


If a computer, not a single Qbit

Our trap and ions

A possible QC scheme


  • Basic concepts of Quantum Computer

  • Ion trap technology

  • Optical Switches for future traps

  • Conclusions


Easiest to think of but not easy to do

Mirror Array

Drawbacks:

Slow

Vibration

Not so reliable

So what?


Optical Switches using EO effect

Very fast !

Very reliable ! – no moving parts

Easier to build ! – just layers

And

expen$ive


Some basic computations

Use 493nm blue light as example:

Waveguide dimension guided wave profile two guides coupling

100% coupling: L=1.09966mm

dn=0.000540554


Some designs

  • Use integrated wave guide instead of free space to propagate lasers.

  • Use simplified electro optical switches to control lasers.


The trap and the wave guide.


  • Basic concepts of Quantum Computer

  • Ion trap technology

  • Optical Switches for future traps

  • Conclusions


  • Ion trap is one of the most promising methods to implement quantum computer.

  • Integrated device is the only way to scale up.

    What else can be integrated?

    Laser diodes

    Modulators


Thank you!

Shu, Gang

Dept. of Phys.

5.24.06


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