@ARTICLE{Lough2021, title = {{F}irst {D}emonstration of 6 d{B} {Q}uantum {N}oise {R}eduction in a {K}ilometer {S}cale {G}ravitational {W}ave {O}bservatory}, status = {}, author = {Lough, J. and Schreiber, E. and Bergamin, F. and Grote, H. and Mehmet, M. and Vahlbruch, H. and Affeldt, C. and Brinkmann, M. and Bisht, A. and Kringel, V. and Lück, H. and Mukund, N. and Nadji, S. and Sorazu, B. and Strain, K. and Weinert, M. and Danzmann, K.}, journal = {Physical Review Letters}, volume = {126}, pages = {}, year = {2021}, }