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Solid State Spins for Quantum Computation

This project investigates the control of electronic spin states in Indium Phosphide (InP) using optical pumping techniques. The primary goal is to determine whether optical pumping is a viable method for manipulating spin states and to assess the duration of the pumped state. By exciting electron-hole pairs to form excitons at low temperatures (~4K) and analyzing emitted light through polarization optics, we seek to uncover additional spectral lines possibly due to strain splitting. Future work will focus on identifying these spectral causes and measuring the spin relaxation rate, contributing to advances in quantum computing.

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Solid State Spins for Quantum Computation

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  1. Solid State Spins for Quantum Computation Emma Lorenzen Knox College UW INT REU Program Advisor: Kai-Mei Fu

  2. Goal: Use optical pumping to control electronic spin states in InP - Need to test whether this is possible and if so how long does stay in the pumped state. Uses: Quantum Computing

  3. Indium Phosphide: • III-V semiconductor • Group IV impurity • At room temperatures the electrons are free to move • At low temperatures (~4K) the electrons are bound to the impurity

  4. Excitons: • Electron–hole pair • Hydrogen like • Excited states • Free excitons: can move freely • Bound excitons are bound to a donor atom Free exciton Bound exciton

  5. Experiment • Excite electrons and holes into an exciton state by shining laser light on the sample while at cold temperatures • Collect the light that is emitted as the hole and electron recombine • By controlling the polarization of the light we can manipulate the spins of the electrons that we are exciting

  6. Polarization Rules: Ground state of exciton bound to neutral donor Ground state of electron weakly bound to neutral donor

  7. Optical Pumping:

  8. Optical Pumping:

  9. Optical Pumping:

  10. Optical Pumping:

  11. Optical Pumping:

  12. Optical Pumping:

  13. Optical Pumping:

  14. Optical Pumping:

  15. Optical Pumping:

  16. Set Up:

  17. Setting Up an Optics Table: Linear polarizer Quarter wave plate Mirror Lens Cryostat

  18. Data Collection: • Cool down the sample to about 4K • Shine laser at sample • Put in polarization optics and measure relative peak intensities

  19. Results so far:

  20. There are extra lines than expected from the literature • 5 vs. 3 • One explanation is that these come from strain splitting W Ruhle, W. Klingenstein, PRB 18, 7011 (1978)

  21. What’s next: • Find the cause of all of the peaks • Determine whether optical pumping is possible by seeing whether the spin relaxation rate is long or fast compared to emission rate • Find spin relaxation rate

  22. Acknowledgements: • Kai-Mei Fu • Deep Gupta and Alejandro Garcia • Linda Vilette and Janine Nemerever • Everyone in the Fu Lab • Becca, Rachel, Emily, Hunter, Scott, Eli, and Jarrett • NSF for funding

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