WP3 – Imaging with Squeezing

Work Package 3 – Imaging with Squeezing

How can a gravity imager be used to predict volcanic eruptions or to find oil and gas reservoirs? Is it possible to have a light source that suppresses noise to below the shot noise limit?

At low light levels, conventional imaging methods such as microscopy and spectroscopy used in the healthcare and biomedical sectors, gravitational imaging and spatial interferometry used in defence applications are limited by the shot-noise of photon detection (Poisson statistics). Work Package 3 – Imaging with Squeezing, harnesses quantum correlations, sensing squeezing, entanglement and quantum optical nonlinearities to develop demonstrator systems that overcome these limitations.

“Q source”, is a single photon light source developed by QuantIC that is even cleaner than a laser that can be engineered to suppress noise to below the shot noise limit. Unlike lasers, single photon sources have a reduced uncertainty on an intensity measurement, which results in a better signal to noise per unit of optical intensity and has been used to support the development of the quantum range finder in Work Package 2.

QuantIC’s “Wee-g” (Middlemiss, R et al. Nature, 531, 614-617, (2016)) has been touted as the most sensitive MicroElectro Mechanical System (MEMS) gravimeter ever developed and has attracted significant industry interest since its development was announced as there are potential applications in industry sectors such as environmental monitoring, oil and gas and defence. “Wee-g” has outperformed all other MEMS devices in the low frequency regime by utilising close loop thermal control and has demonstrated sufficient performance and long-term stability to allow the measurement of the Earth-tides, something no MEMS-based instrument has never been able to perform before. It is fabricated as a single component from silicon. It has so far secured industry projects with Bridgeporth, Clyde Space, QinetiQ and Schlumberger.

To open up applications in bio-imaging, our researchers have also developed a highly squeezed pulsed light source suitable for pump-probe microscopy. In parallel, theoretical efforts have focused on the formulation of a complete theory of quantum imaging, based on multi-parameter estimation theory. This multi-parameter approach will enable the imaging of entire samples rather than scanning across them.