Quantum technologies exploit entanglement to revolutionize computing, measurements, and
communications. This has stimulated the research in different areas of physics to engineer …

Quantum entanglement has been generated and verified in cold-atom experiments and
used to make atom-interferometric measurements below the shot-noise limit. However …

We investigate the performance of entangled coherent states for quantum-enhanced phase
estimation. An exact analytical expression of quantum Fisher information is derived to show …

Methods for, and limitations to, the generation of entangled states of trapped atomic ions are
examined. As much as possible, state manipulations are described in terms of quantum …

Classical optical lithography is diffraction limited to writing features of a size λ/2 or greater,
where λ is the optical wavelength. Using nonclassical photon-number states, entangled N at …

We study the sensitivity and resolution of phase measurement in a Mach-Zehnder
interferometer with two-mode squeezed vacuum (n¯ photons on average). We show that …

Heisenberg-limited measurement protocols can be used to gain an increase in
measurement precision over classical protocols. Such measurements can be implemented …

Interferometers with atomic ensembles are an integral part of modern precision metrology.
However, these interferometers are fundamentally restricted by the shot noise limit, which …

I derive the quantum phase-noise limit to the sensitivity of a Mach-Zehnder interferometer in
which the incident quantum particles enter via both input ports. I show that if the incident …

We experimentally investigate three methods, utilizing different atomic observables and
entangled states, to increase the sensitivity of rotation angle measurements beyond the …