We propose a back-action evading scheme for a free mass that combines reservoir engineering with velocity measurement. The underlying principle follows the double-pass-type speed meter, which measures the mirror's velocity using a nonreciprocal interaction. In our method, the nonreciprocal coupling is realized through reservoir engineering, following the recipe proposed in [Phys. Rev. X 5, 021025]. We show that reservoir engineering can reproduce the double-pass speed meter with optimal feedforward, using only reciprocal interactions. The resulting force sensitivity surpasses the standard quantum limit, providing an alternative route to quantum back-action evasion in cavity optomechanical systems.
Cite
@article{arxiv.2505.01013,
title = {Quantum Back Action Evasion with Reservoir Engineering},
author = {Yohei Nishino and James W. Gardner and Yanbei Chen and Kentaro Somiya},
journal= {arXiv preprint arXiv:2505.01013},
year = {2025}
}