Observing and evading quantum back-action on a kilogram-scale oscillator

@misc{kabagoz2026observing,
  title = {{Observing and evading quantum back-action on a kilogram-scale oscillator}},
  author = {Begüm Kabagöz and Eric Oelker and Dhruva Ganapathy and Nergis Mavalvala and Vivishek Sudhir and Vladimir Bossilkov and Joseph Betzweiser and Valery V. Frolov and Anamaria Effler and Adam Mullavey and Lisa Barsotti and Evan D. Hall and Peter Fritschel and R. Abbott and I. Abouelfettouh and R. X. Adhikari and A. Ananyeva and S. Appert and S. K. Apple and K. Arai and N. Aritomi and S. M. Aston and M. Ball and S. W. Ballmer and D. Barker and B. K. Berger and D. Bhattacharjee and G. Billingsley and S. Biscans and C. D. Blair and N. Bode and E. Bonilla and A. Branch and A. F. Brooks and D. D. Brown and J. Bryant and C. Cahillane and A. Calafat and S. R. Callos and H. Cao and E. Capote and F. Clara and J. Collins and C. M. Compton and G. Connolly and R. Cottingham and D. C. Coyne and R. Crouch and J. Csizmazia and A. Cumming and L. P. Dartez and D. Davis and N. Demos and E. Dohmen and K. L. Dooley and J. C. Driggers and S. E. Dwyer and A. Ejlli and T. Etzel and M. Evans},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.19317},
  eprint = {2609.19317},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.19317},
  note = {CC BY-NC-ND 4.0},
}

TY  - UNPB
TI  - Observing and evading quantum back-action on a kilogram-scale oscillator
AU  - Begüm Kabagöz
AU  - Eric Oelker
AU  - Dhruva Ganapathy
AU  - Nergis Mavalvala
AU  - Vivishek Sudhir
AU  - Vladimir Bossilkov
AU  - Joseph Betzweiser
AU  - Valery V. Frolov
AU  - Anamaria Effler
AU  - Adam Mullavey
AU  - Lisa Barsotti
AU  - Evan D. Hall
AU  - Peter Fritschel
AU  - R. Abbott
AU  - I. Abouelfettouh
AU  - R. X. Adhikari
AU  - A. Ananyeva
AU  - S. Appert
AU  - S. K. Apple
AU  - K. Arai
AU  - N. Aritomi
AU  - S. M. Aston
AU  - M. Ball
AU  - S. W. Ballmer
AU  - D. Barker
AU  - B. K. Berger
AU  - D. Bhattacharjee
AU  - G. Billingsley
AU  - S. Biscans
AU  - C. D. Blair
AU  - N. Bode
AU  - E. Bonilla
AU  - A. Branch
AU  - A. F. Brooks
AU  - D. D. Brown
AU  - J. Bryant
AU  - C. Cahillane
AU  - A. Calafat
AU  - S. R. Callos
AU  - H. Cao
AU  - E. Capote
AU  - F. Clara
AU  - J. Collins
AU  - C. M. Compton
AU  - G. Connolly
AU  - R. Cottingham
AU  - D. C. Coyne
AU  - R. Crouch
AU  - J. Csizmazia
AU  - A. Cumming
AU  - L. P. Dartez
AU  - D. Davis
AU  - N. Demos
AU  - E. Dohmen
AU  - K. L. Dooley
AU  - J. C. Driggers
AU  - S. E. Dwyer
AU  - A. Ejlli
AU  - T. Etzel
AU  - M. Evans
PY  - 2026
DA  - 2026/09/16
PB  - arXiv
DO  - 10.48550/arxiv.2609.19317
UR  - https://arxiv.org/abs/2609.19317
AB  - Continuous quantum displacement measurements are fundamentally limited by a trade-off between readout imprecision and measurement back-action, constrained by the Heisenberg uncertainty principle. In the Laser Interferometric Gravitational-Wave Observatory (LIGO), these two quantum noise components dominate much of the observation band, making it an excellent testbed. We induce a sub-Hz-linewidth optomechanical mode by trapping the differential motion of the 40-kg mirrors in a band where radiation-pressure back-action dominates the motion. Engineering the quantum state entering the dark port creates correlations between imprecision and back-action that partially cancel their contributions, reducing observed motion near resonance by ~47%. A framework resolving the imprecision, back-action, and correlation terms identifies the origin of this suppression. These results demonstrate quantum back-action evasion and quantum reservoir engineering in a macroscopic optomechanical system.
ER  -