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Optomechanical Dynamics in Rotator Systems

Explore the advantages of optomechanical systems with emphasis on cavity interference and cooling techniques. Learn about quantum state preservation and solutions for reducing thermal noise. Discover the potential for optical dilution in addressing these challenges.

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Optomechanical Dynamics in Rotator Systems

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  1. Ponderomotive rotator: requirements Zach Korth (Caltech) – GWADW ‘12 – Waikoloa, HI

  2. The optomechanical advantage • Simple cavity: interference between optical pathways produces amplitude/phase shifts • Optomechanical cavity: Added pathway through mechanical system  modification of dynamics Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  3. Optomechanical dynamics Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  4. Optomechanical dynamics Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  5. Sideband cooling • Upshifted SB is resonant  • Cooling limit:  want Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  6. OMIT • Introduce second, “probe” beam at • Produces radiation pressure force at laser beat frequency, Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  7. OMIT • RP force excites mechanical oscillator • As it cools, it scatters a photon up by Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  8. OMIT • Optomechanical coupling rate: • To preserve quantum state, must have Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  9. OMIT as a rotator FI squeezing  FD squeezing  Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  10. Thermal noise FI squeezing  FD squeezing  SIGNAL NOISE Pump detuning  Rotation frequency  Thermal force spectrum Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  11. Thermal noise Need Or, Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  12. Solutions? • One idea: optical dilution Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  13. The End • ANYONE HAVE ANY IDEAS? LET US KNOW! • Acknowledgements • Haixing Miao • Thomas Corbitt • Amir Safavi-Naeini (O. Painter group, CIT) • References: • Weis, et al., “Optomechanically induced transparency,” Science330 (6010), 2010 • Safavi-Naeini, et al., “Electromagnetically induced transparency and slow light with optomechanics,” Nature 472, 2011 • Corbitt, et al., “Optical Dilution and Feedback Cooling of a Gram-Scale Oscillator to 6.9 mK,” Phys. Rev. Lett.99 160801 (2007) Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

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