Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 9: Precision Measurements and Metrology II
Q 9.5: Vortrag
Montag, 14. März 2022, 17:45–18:00, Q-H11
Frequency-Dependent Squeezing from a Squeezer — •Jonas Junker1,2,3, Nived Johny1,2,3, Dennis Wilken1,2,3, and Michèle Heurs1,2,3 — 1Max Planck Institute for Gravitational Physics, and Institute for Gravitational Physics, Germany — 2QuantumFrontiers — 3PhoenixD
In opto-mechanical force measurements, quantum back-action noise fundamentally limits the measurement sensitivity at low frequencies. To reduce or even evade back-action noise, several techniques have been proposed, e.g. the injection of squeezed light. When the squeezed sidebands have a frequency-dependent phase difference the noise can be likewise reduced in a broad frequency band. However, for a full back-action evasion, an inversely input squeezed state [1] serving as an effective negative mass oscillator can be used [2]. This state calls not only for a frequency-dependent squeezing phase but also for a frequency-dependent squeezing factor. In our talk, we present the idea of using a detuned optical-parametric oscillator (OPO) to generate this needed state. We briefly show how we have realized and experimentally controlled our detuned OPO. We reconstruct the output state of this squeezer with quantum tomography for different measurement frequencies. This allows to even visually demonstrate and analyze the frequency-dependent state rotation. Our system seems to be applicable as a non-ideal, but very simple effective-negative mass oscillator applicable in opto-mechanical force measurements limited by back-action noise. [1] Kimble et al. Phys. Rev. D65, 022002 (2001) [2] Wimmer, Steinmeyer, Hammerer, and Heurs, Phys. Rev. A89,053836 (2014)