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Nano- and micromechanical oscillators act as great sensors of a wide variety of signals, but their sensitivity and bandwidth can be limited by quantum backaction imposed by optomechanical displacement measurement. We experimentally demonstrate a new paradigm for optomechanical measurement and control based on strong interactions with short light pulses. Using unique nanophotonic optomechanical cavities, we show that single pulsed measurements can achieve sub-quantum-limit resolution. Moreover, we demonstrate a new protocol to deterministically produce squeezed mechanical states, which can reduce single-quadrature fluctuations to arbitrarily small magnitudes. We discuss the application of the resulting squeezing and entanglement for mechanical quantum sensing.
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Pascal Neveu, Jack Clarke, Michael Vanner, Ewold Verhagen, "Nanomechanical squeezing through strong optical measurements for quantum metrology," Proc. SPIE PC12447, Quantum Sensing, Imaging, and Precision Metrology, PC1244730 (9 March 2023); https://doi.org/10.1117/12.2649302