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Quantum metrology with nonclassical states of atomic ensembles
Quantum technologies exploit entanglement to revolutionize computing, measurements, and
communications. This has stimulated the research in different areas of physics to engineer …
communications. This has stimulated the research in different areas of physics to engineer …
Entanglement certification from theory to experiment
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 …
quantum systems can be entangled, ranging from the two-qubit case to entanglement in …
Direct comparison of two spin-squeezed optical clock ensembles at the 10−17 level
Building scalable quantum systems that demonstrate performance enhancement based on
entanglement is a major goal in quantum computing and metrology. The main challenge …
entanglement is a major goal in quantum computing and metrology. The main challenge …
Entanglement-enhanced matter-wave interferometry in a high-finesse cavity
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 …
superposition of two different states. Upon measurement of the sensor, each atom is …
A steady-state superradiant laser with less than one intracavity photon
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 …
waves, defining the second,, ground-state cooling and quantum manipulation of …
Deterministic squeezed states with collective measurements and feedback
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 …
measurement and real-time feedback. The pseudospin state of an ensemble of N= 5× 10 4 …
Probing quantum correlations in many-body systems: a review of scalable methods
We review methods that allow one to detect and characterize quantum correlations in many-
body systems, with a special focus on approaches which are scalable. Namely, those …
body systems, with a special focus on approaches which are scalable. Namely, those …
Scalable spin squeezing for quantum-enhanced magnetometry with Bose-Einstein condensates
A major challenge in quantum metrology is the generation of entangled states with a
macroscopic atom number. Here, we demonstrate experimentally that atomic squeezing …
macroscopic atom number. Here, we demonstrate experimentally that atomic squeezing …
Fisher information and entanglement of non-Gaussian spin states
Entanglement is the key quantum resource for improving measurement sensitivity beyond
classical limits. However, the production of entanglement in mesoscopic atomic systems has …
classical limits. However, the production of entanglement in mesoscopic atomic systems has …
Magnetic sensitivity beyond the projection noise limit by spin squeezing
We report the generation of spin squeezing and entanglement in a magnetically sensitive
atomic ensemble, and entanglement-enhanced field measurements with this system. A …
atomic ensemble, and entanglement-enhanced field measurements with this system. A …