Integrated photonics is providing a compelling route for quantum limited and quantum enhanced technologies, including computing communications and optical sensing. This is because chip-scale integrated photonics can offer miniaturization as well as possible scalability in manufacture. Here we will discuss recent results in developing integrated homodyne detection integrated in silicon photonics. We discuss its combination with integrated electronics to demonstrate high bandwidth performance and its use to measure squeezed light over a broad bandwidth, out to 9GHz. This demonstrates a performance enhancement that is relevant to quantum technology and is due to miniaturization. We will discuss possible applications of of integrated quantum noise listed homodyne detection, including a strategy to perform quantum limited absorption estimation using integrated photonics and coherent states.
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.
Conference Committee Involvement (6)
Emerging Imaging and Sensing Technologies for Security and Defence X
15 September 2025 | Madrid, Spain
Emerging Imaging and Sensing Technologies for Security and Defence IX
17 September 2024 | Edinburgh, United Kingdom
Emerging Imaging and Sensing Technologies for Security and Defence VIII
5 September 2023 | Amsterdam, Netherlands
Emerging Imaging and Sensing Technologies for Security and Defence VII
5 September 2022 | Berlin, Germany
Emerging Imaging and Sensing Technologies for Security and Defence VI
13 September 2021 | Online Only, Spain
Emerging Imaging and Sensing Technologies for Security and Defence V; Advanced Manufacturing Technologies for Micro- and Nanosystems in Security and Defence III
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