Investigation of non-classical light and its application in ultrasensitive measurements

Daniel C. Kilper, John Erland, Duncan G. Steel

Jörg Bialas, R. Blatt, Werner Neuhauser +1 more

B. Hüttner, J.J. Baumberg, J.F. Ryan +1 more

Korenobu Matsuzaki, Tahei Tahara

Quantum light, such as entangled photon pairs, is a special state of light that cannot be described by classical electrodynamics. Owing to its exotic nonclassical properties, the use of quantum light can open up a new possibility for spectroscopy that cannot be realized by a classical light source. Recently, using entangled photon pairs as the light source, we demonstrated ultrasensitive absorption spectroscopy with quantum-enhanced sensitivity [1]. This novel approach allows us to obtain absorption spectra with a noise level suppressed below the shot-noise limit, which is a fundamental and unavoidable limit in conventional absorption spectroscopy. In this presentation, we will discuss two applications of this sub-shot-noise absorption spectroscopy.

Benjamin J. Lawrie, Raphael C. Pooser

We demonstrate sub-shot-noise microcantilever displacement sensitivity using simple differential measurements with multi-spatial-mode squeezed light, a result that may be critical for ultra-trace sensing and imaging applications.

R. Loudon