LIGO Document T2100198-v1

Building blocks of a PT-symmetric interferometer

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T - Technical notes
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In this project, we work with the PT-symmetric interferometer. We aim to explore a more complete PT-symmetric structure to improve the low-frequency noise spectrum by back-action evasion with an effective negative mass. The effective negative mass will be possibly be achieved using parametric amplifi cation and optical damping formed by multiple additional pumpings, and hence, have a larger bandwidth with sacrifi cing less of the sensitivity than we would for a conventional trade-off between the bandwidth and sensitivity.
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