Bulletin of the American Physical Society
APS April Meeting 2011
Volume 56, Number 4
Saturday–Tuesday, April 30–May 3 2011; Anaheim, California
Session G5: Pipkin Award and Quantum Technologies for Gravitational Wave Detection |
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Sponsoring Units: GGR GPMFC Chair: Blayne Heckel, University of Washington Room: Royal AB |
Sunday, May 1, 2011 8:30AM - 9:06AM |
G5.00001: Squeezed Light Techniques for Gravitational Wave Detection Invited Speaker: Several kilometer long interferometers have been built over the past decade to search for gravitational waves of astrophysical origins. For the next generation detectors intra-cavity powers of several 100 kW are envisioned. The injection of squeezed light, a specially prepared quantum state, has the potential to further increase the sensitivity of these detectors. The technology behind squeezed light production has taken impressive steps forward in recent years. As a result a series of experiments is underway to prove the effectiveness of squeezed light and to make quantum technology a valid upgrade path for gravitational wave detectors. [Preview Abstract] |
Sunday, May 1, 2011 9:06AM - 9:42AM |
G5.00002: Quantum Noise and Opto-mechanics in Advanced Gravitational-wave Detectors Invited Speaker: The Laser Interferometer Gravitational-wave Observatory (LIGO) project and other international efforts aim to directly observe gravitational waves. In this pursuit, extremely precise measurements require that the sensitivities of the measurement devices be lowered to quantum limits inherit to the measurement process. This limit is manifested as shot and radiation pressure noise, and I will review strategies for their reduction. I will also describe the opto-mechanical coupling that arises from the very high levels of laser power used in the measurement, and which has a profound impact on the operation and sensitivity of the detectors. Finally, I will present results from a series of prototype experiments designed to explore these effects in preparation for advanced detectors, and discuss how these devices may also be interesting to fundamental quantum mechanics research. [Preview Abstract] |
Sunday, May 1, 2011 9:42AM - 10:18AM |
G5.00003: Francis M. Pipkin Award Talk: Lorentz and CPT Symmetry Tests with Atomic Co-Magnetometers Invited Speaker: Deviations from Lorentz symmetry naturally arise in many extensions of the Standard Model seeking to include quantum gravity effects. One of the common features of such models is coupling to a particle spin that violates local Lorentz invariance. We have developed a co-magnetometer using spin-polarized K and $^3$He atoms to perform a sensitive search for such effects. The co-magnetometer measures the difference between spin interactions of electrons and $^3$He nuclei, thereby canceling the signals from ordinary magnetic fields. The apparatus is rotated every 20 seconds to search for a spatial anisotropy. We have placed a limit on neutron interaction energy with a background Lorentz-violating field below $3.7\times 10^{-33}$ GeV, improving the previous limit by a factor of 30. Because of close connection between CPT and Lorentz symmetry, this measurement also represents the most stringent test of CPT for a fermion. One can also test Lorentz-violating theories that do not break CPT symmetry by using particles with a spin greater than 1/2 to search for a tensor spin anisotropy. We are currently using a co-magnetometer with $^{21}$Ne atoms to perform such a search. [Preview Abstract] |
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