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

Entanglement is an important resource for quantum technologies. There are many ways
quantum systems can be entangled, ranging from the two-qubit case to entanglement in …

Building scalable quantum systems that demonstrate performance enhancement based on
entanglement is a major goal in quantum computing and metrology. The main challenge …

An ensemble of atoms can operate as a quantum sensor by placing atoms in a
superposition of two different states. Upon measurement of the sensor, each atom is …

The spectral purity of an oscillator is central to many applications, such as detecting gravity
waves, defining the second,, ground-state cooling and quantum manipulation of …

We demonstrate the creation of entangled, spin-squeezed states using a collective, or joint,
measurement and real-time feedback. The pseudospin state of an ensemble of N= 5× 10 4 …

In both classical and quantum many-body physics, it is a core issue to characterize statistical
correlations among different degrees of freedom. From this point of view, a natural question …

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

Entanglement is the key quantum resource for improving measurement sensitivity beyond
classical limits. However, the production of entanglement in mesoscopic atomic systems has …

A major challenge in quantum metrology is the generation of entangled states with a
macroscopic atom number. Here, we demonstrate experimentally that atomic squeezing …