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Testing Macroscopic Quantum Mechanics (MQM) with Future GW Detectors

Testing Macroscopic Quantum Mechanics (MQM) with Future GW Detectors . Haixing Miao . University of Western Australia (UWA). A brief report of theoretical works by the LIGO-MQM discussion group : Albert Einstein Institute : Helge Müller-Ebhardt , and Roman Schnable

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Testing Macroscopic Quantum Mechanics (MQM) with Future GW Detectors

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  1. Testing Macroscopic Quantum Mechanics (MQM) with Future GW Detectors Haixing Miao University of Western Australia (UWA) A brief report of theoretical works by the LIGO-MQM discussion group: • Albert Einstein Institute: HelgeMüller-Ebhardt, and Roman Schnable • Caltech: Yanbei Chen, Ting Hong, KentaroSomiya,Kip Thorne and Huan Yang • MIT: Thomas Corbitt, NergisMavalvala, and Christopher Wipf Moscow State University: Stefan Danilishin, and FaridKhalili • UWA: Haixing Miao, ChunnongZhao, and Zhongyang Zhang

  2. We are not alone:-) 1 Yale UCSB Vienna MIT LIGO GWADW 17th May – 21st May, 2010 From ng up to kg Caltech AEI CLIO LKB UWA • Optomechanics:

  3. Motivations 2 GWADW 17th May – 21st May, 2010 >>Quantum-limited measurement of weak forces and beyond >>Quantum-to-classical transition >>Quantum information with mechanical devices

  4. How quantum a GW detector is? 3 Order-of-magnitude estimate: Detector sensitivity: De Broglie wavelength: How about thermal decoherence? --- It is just a matter of timing. GWADW 17th May – 21st May, 2010

  5. A simplified model of noise budget 4 Three interesting frequencies: GWADW 17th May – 21st May, 2010

  6. An analogy: understanding 5 GWADW 17th May – 21st May, 2010 increase Increase shutter speed: increase Increase resolution:

  7. (I) Preparing pure quantum state 6 Increase GWADW 17th May – 21st May, 2010 >> Pure state: occupying an area in the phase space

  8. (II) Studying quantum dynamics 7 GWADW 17th May – 21st May, 2010 Modifying test-mass dynamics: Optical Spring Quantitative results: If , squeezing “breaths” for 5 cycles.

  9. Quantum entanglement 8 GWADW 17th May – 21st May, 2010

  10. (III) Light & test mass entanglement 9 “Classical” analogy: GWADW 17th May – 21st May, 2010 Open Choice Infer Light & test mass: Light Test Mass Steerability

  11. (IV) Entanglement among test masses 10 Scheme I Scheme II GWADW 17th May – 21st May, 2010 Entangling TMs in two arms Entangling ITMs and ETMs Comment: A long survival time allows us to study various decoherence effects, e.g, the thermal and also gravity decoherence. Survival time (s)

  12. (V) Teleporting quantum states 11 Hanford Livingston GWADW 17th May – 21st May, 2010 Create a coupled pendulum and the quantum states swap.

  13. Conclusions 12 >> GW detectors can be fancy tools for probing MQM. >> We have outlined possible MQM experiments. >>A sub-SQL classical noise window is essential. GWADW 17th May – 21st May, 2010

  14. The end 13 GWADW 17th May – 21st May, 2010 Interested in the technical details? Join the CLIO-MQM workshop at Tokyo! Thank you!

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