Reducing Quantum Noise in Advanced LIGO detectors

During the first two observing runs, the Laser Interferometer Gravitational-Wave Observatory (LIGO) detected gravitational waves from the merging of multiple binary black hole systems and one binary neutron star system. Following a period of down time for upgrades, LIGO's third observing run will begin early 2019 and continue for approximately one year. Upgrades include increased laser input power and squeezed quantum state injection to reduce fundamental quantum noise. This talk discusses these upgrades and their impact on our sensitivity.