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8 papers · 2 filters
Entanglement of large atomic samples: a Gaussian state analysis
Jacob Sherson, Klaus Moelmer
We present a Gaussian state analysis of the entanglement generation between two macroscopic atomic ensembles due the continuous probing of collective spin variables by optical Fara…
Experimental demonstration of quantum memory for light
Brian Julsgaard, Jacob Sherson, J. Ignacio Cirac +2
The information carrier of today's communications, a weak pulse of light, is an intrinsically quantum object. As a consequence, complete information about the pulse cannot, even in…
Magnetometry with entangled atomic samples
Vivi Petersen, Lars Bojer Madsen, Klaus Molmer
We present a theory for the estimation of a scalar or a vector magnetic field by its influence on an ensemble of trapped spin polarized atoms. The atoms interact off-resonantly wit…
Distant Entanglement of Macroscopic Gas Samples
J. Sherson, B. Julsgaard, E. S. Polzik
One of the main ingredients in most quantum information protocols is a reliable source of two entangled systems. Such systems have been generated experimentally several years ago f…
Unitarity as preservation of entropy and entanglement in quantum systems
Florian Hulpke, Uffe V. Poulsen, Anna Sanpera +3
The logical structure of Quantum Mechanics (QM) and its relation to other fundamental principles of Nature has been for decades a subject of intensive research. In particular, the…
Spin squeezing and precision probing with light and samples of atoms in the gaussian approximation
Lars Bojer Madsen, Klaus Mølmer
We consider an ensemble of trapped atoms interacting with a continuous wave laser field. For sufficiently polarized atoms and for a polarized light field, we may approximate the no…