Środowiskowe Seminarium z Informacji i Technologii Kwantowych
sala 1.03, ul. Pasteura 5
2021-10-28 (11:15) 
Lewis Clark (QOT CENT UW)
Enhancing the performance of optomechanical sensors by continuous photon-counting
The Seminar will take a HYBRID form. It will take place in room 1.03 but will be simmultaneously tranmitted via ZOOM under the following link: https://zoom.us/j/92894130767 (Passcode: R6Vx6E)
Optomechanical systems are rapidly becoming one of the most promising platforms for observing quantum behaviour, even approaching macroscopic systems. These systems are well understood at both a theoretical and experimental level. The potential for using such devices for applications such as quantum sensing is thus high, and some work has already been carried out to understand how such devices can be used. Motivated by the recent interest in using continuous measurements and Bayesian inference as a tool for quantum sensing, we apply these techniques to an optomechanical system in this work. We find that even with a single quantum trajectory of photon-click events, we are capable of accurately inferring optomechanical parameters being sensed, such as the internal frequency of the mechanical oscillator or its light-coupling strength, with average precision that can surpass the bound set by the quantum Fisher information for a single-shot measurement in reasonable amounts of time. Our work thus presents a novel approach to quantum sensing in optomechanical systems, having potential to guide the design of future devices.
Optomechanical systems are rapidly becoming one of the most promising platforms for observing quantum behaviour, even approaching macroscopic systems. These systems are well understood at both a theoretical and experimental level. The potential for using such devices for applications such as quantum sensing is thus high, and some work has already been carried out to understand how such devices can be used. Motivated by the recent interest in using continuous measurements and Bayesian inference as a tool for quantum sensing, we apply these techniques to an optomechanical system in this work. We find that even with a single quantum trajectory of photon-click events, we are capable of accurately inferring optomechanical parameters being sensed, such as the internal frequency of the mechanical oscillator or its light-coupling strength, with average precision that can surpass the bound set by the quantum Fisher information for a single-shot measurement in reasonable amounts of time. Our work thus presents a novel approach to quantum sensing in optomechanical systems, having potential to guide the design of future devices.