Increasing the optical power in sub-shot noise precision measurements of absorption

Jonathan C. Matthews

doi:10.1117/12.2574665

20 September 2020 Increasing the optical power in sub-shot noise precision measurements of absorption

Jonathan C. Matthews

Proceedings Volume 11540, Emerging Imaging and Sensing Technologies for Security and Defence V; and Advanced Manufacturing Technologies for Micro- and Nanosystems in Security and Defence III; 1154009 (2020) https://doi.org/10.1117/12.2574665
Event: SPIE Security + Defence, 2020, Online Only

Abstract

The optical shot-noise limit of a laser beam represents the classical limit in precision and signal to noise ratio achievable in optical sensors and imaging systems. It is known that quantum states of light, such as squeezed light and quantum correlated twin beams can be used to enhance precision and signal to noise ratio to beyond this limit. This promises optical sensors with fundamentally superior performance to the state of the art. While quantum-enhanced signal to noise ratio has been demonstrated with macroscopic powers of squeezed probe beam, demonstrations of quantum enhanced precision have remained at extremely low powers of light (femto-Watts). Here we will give examples where increasing SNR with quantum light is not sufficient to increase precision and we will review proof of principle experiments that have demonstrated sub shot noise precision, including for absorption spectroscopy and imaging. We will also report our efforts to achieve this sub-shot-noise precision performance for transmission measurement with ~0.1mW of average probe power, equating to ~10W peak power in a pulsed experiment. Time permitting, we will discuss how integrated optics and integrated electronics enables 10s GHz bandwidth in the detection of squeezed light, for integrated quantum sensor technology.

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Jonathan C. Matthews "Increasing the optical power in sub-shot noise precision measurements of absorption", Proc. SPIE 11540, Emerging Imaging and Sensing Technologies for Security and Defence V; and Advanced Manufacturing Technologies for Micro- and Nanosystems in Security and Defence III, 1154009 (20 September 2020); https://doi.org/10.1117/12.2574665

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KEYWORDS

Signal to noise ratio

Absorption

Imaging spectroscopy

Optical sensors

Absorption spectroscopy

Electronics

Imaging systems

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