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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Optics (Miscellaneous) II
Q 12.2: Vortrag
Montag, 14. März 2022, 16:45–17:00, Q-H14
Compensating decoherence of squeezed light in cavity-enhanced quantum metrology — •Mikhail Korobko1, Jan Südbeck1, Sebastian Steinlechner2, and Roman Schnabel1 — 1Institut für Laserphysik und Zentrum für Optische Quantentechnologien, Universität Hamburg — 2Maastricht University, Netherlands
Quantum states of light are commonly used to enhance detection in modern sensors. For instance, quantum squeezed light allows to reach high sensitivity without using significant optical power, and thus it finds application in various metrological devices, from biological sensing to gravitational-wave detection. At the same time, quantum states are very fragile, and even a small amount of decoherence significantly impacts them. For example, decoherence due to optical loss limits the benefit from using squeezed light to enhance the sensitivity of cavity-enhanced sensors, such as gravitational-wave detectors. We propose a new approach that allows to compensate a significant part of quantum decoherence, thus increasing the sensitivity beyond the previously established decoherence-induced quantum limit. To achieve this, we use an optimally tuned quantum squeezer placed directly inside the detector cavity. We present the first experimental combination of intra-cavity and externally injected squeezing used to enhance the sensitivity. We use intra-cavity squeezing to demonstrate for the first time quantum enhancement to the sensitivity that is not affected by the increase in optical loss. Finally, we derive the new decoherence-induced quantum limit. Our approach will add the new level of flexibility to the design of quantum sensors.