According to quantum theory the energy exchange between physical systems is quantized.
As a direct consequence, measurement sensitivities are fundamentally limited by …

This paper reviews quantum spin squeezing, which characterizes the sensitivity of a state
with respect to SU (2) rotations, and is significant for both entanglement detection and high …

Quantum metrology is one of the most promising applications of quantum technologies. The
aim of this research field is the estimation of unknown parameters exploiting quantum …

The minimum resolvable signal in sensing and metrology platforms that rely on optical
readout fields is increasingly constrained by the standard quantum limit, which is determined …

The quantum noise of light, attributed to the random arrival time of photons from a coherent
light source, fundamentally limits optical phase sensors. An engineered source of squeezed …

Around the globe several observatories are seeking the first direct detection of gravitational
waves (GWs). These waves are predicted by Einstein's general theory of relativity and are …

Quantum precision enhancement is of fundamental importance for the development of
advanced metrological optical experiments, such as gravitational wave detection and …

Nearly a century after Einstein first predicted the existence of gravitational waves, a global
network of Earth-based gravitational wave observatories,,, is seeking to directly detect this …

Conventional interferometers usually utilize beam splitters for wave splitting and
recombination. These interferometers are widely used for precision measurement. Their …

We report on the first long-term application of squeezed vacuum states of light to improve the
shot-noise-limited sensitivity of a gravitational-wave observatory. In particular, squeezed …