1 / 19

A Single Photon Source for Photon-atom Interaction

A Single Photon Source for Photon-atom Interaction. Xingxing Xing Centre for Quantum Info. & Quantum Control, Dept. of Physics, Univ. of Toronto. CQISC 2006, Calgary. Group member. Photonics lab @Toronto Rob Adamson Lynden (Krister) Shalm Xingxing Xing Dr. An-Ning Zhang

risa
Download Presentation

A Single Photon Source for Photon-atom Interaction

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A Single Photon Source for Photon-atom Interaction Xingxing Xing Centre for Quantum Info. & Quantum Control, Dept. of Physics, Univ. of Toronto CQISC 2006, Calgary

  2. Group member • Photonics lab @Toronto • Rob Adamson • Lynden (Krister) Shalm • Xingxing Xing • Dr. An-Ning Zhang • Prof. Aephraim Steinberg CQISC 2006, Calgary

  3. Outline • Why single photon source? • Why photon-atom interaction? • How to build up a source? • What could we use the source for? CQISC 2006, Calgary

  4. Motivation • Necessity of a single photon source? • Investigate non-classical behaviors • Use in quant logic, quant crypto., etc. CQISC 2006, Calgary

  5. Motivation • Photons are ideal carrier for Quantum Info Processing and Q. Computation • easy to generate and manipulate • stable: not interact much with environment • LOQC scheme could be essential as part of quantum computation networks • Problems • Photons don’t interact much with envi.  hard for storage • Experience losses during commu.  reconstruct states • They don’t interact with each other either!  two-qubit gates? CQISC 2006, Calgary

  6. Motivation • On the other hand, atoms are good for some aspects: • They interact strongly with each other  good candidate for two-qubit gates • Long decoherence time is possible: trapping  quantum memory and quantum repeater • Combination of the two: Perfect! CQISC 2006, Calgary

  7. Methods Comparison of Different Schemes of Single photon source CQISC 2006, Calgary

  8. Methods • PDC is good, except for the bandwidth • Make use of cavity: confine the spectrum, also known as Optical Parametric Oscillator (OPO) CQISC 2006, Calgary

  9. Doppler-free Saturated Spectroscopy • Problem: narrow linewidth of atoms: ~6MHz • Doppler shift • The frequency of a moving source/observer is shifted relative to the observer/source. NOTE: the real freq. doesn’t change! • For a moving observer • Vo: speed of observer: positive if the observer is moving away from the source negative if the observer is moving towards the source CQISC 2006, Calgary

  10. Doppler • Stationary and moving source CQISC 2006, Calgary

  11. Doppler effect in photon-atom interaction • Doppler broadening inabsorption profile CQISC 2006, Calgary

  12. OPO Setup CQISC 2006, Calgary

  13. Testing of the laser linewidth CQISC 2006, Calgary

  14. Next step… • Optimize SHG • Setup OPO cavity and optimize it • Play with the source… CQISC 2006, Calgary

  15. Potential Applications • Electromagnetically Induced Transparency (EIT) • Quantum Memory • Quantum Repeater • As a tool to investigate the fundamentals of QM through interaction with cold atoms/BEC • Gap between Classical and quantum world? • Single photon - single atom? • For rent: a single photon source for free space QKD… CQISC 2006, Calgary

  16. EIT • Group velocity & coupling filed • The state of interaction system: photon + atom: CQISC 2006, Calgary

  17. Storage through EIT Fleischhauer, PRL 84, 5094, 2000 CQISC 2006, Calgary

  18. Quantum repeater L.-M., Duan et.al., 414, 413 CQISC 2006, Calgary

  19. Summary • A scheme for narrow bandwidth single-photon source (triggered deterministic) • Such photon-atom interaction could help fill the gap between LCQO and atomic physics • Questions? Comments? Suggestions? CQISC 2006, Calgary

More Related