1. Integrated electronic optical switches in future chip ion trap Shu, Gang 5/24/2006

2. Basic concepts of Quantum Computer Ion trap technology Optical Switches in future traps Conclusions

3. Basic concepts of Quantum Computer Ion trap technology Optical Switches in future traps Conclusions

4. 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. computationquantum mechanicalsuperposition entanglement computationquantum mechanicalsuperposition entanglement

5. A computer architecture must include two fundamental elements: 1.A mathematics system that can represent and solve general problems. 2.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.

6. 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? So, what? Quantum Algorithms and QC Quantum Algorithms and QC 2. Physicists never forget physics: We want to study complicated quantum system, why not simulate it with a quantum device? 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.

7. 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…

8. QC’s secret Q bit A state vector carrying all information and our hope.

9. Basic concepts of Quantum Computer Ion trap technology Optical Switches in future traps Conclusions

10. 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

11. 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

12. If a computer, not a single Qbit A possible QC scheme Our trap and ions

13. Basic concepts of Quantum Computer Ion trap technology Optical Switches for future traps Conclusions

14. Easiest to think of but not easy to do Mirror Array Drawbacks:SlowVibration Not so reliable So what?

15. Optical Switches using EO effect Very fast ! Very reliable ! – no moving parts Easier to build ! – just layers Andexpen$ive

16. 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

17. Some designs Use integrated wave guide instead of free space to propagate lasers. Use simplified electro optical switches to control lasers.

18. The trap and the wave guide.

19. Basic concepts of Quantum Computer Ion trap technology Optical Switches for future traps Conclusions

20. 1.Ion trap is one of the most promising methods to implement quantum computer. 2.Integrated device is the only way to scale up. What else can be integrated? Laser diodes Modulators

21. Thank you! Shu, Gang Dept. of Phys. 5.24.06