Quantum control of spin-correlations in ultracold lattice gases

Abstract

We demonstrate that it is possible to prepare a lattice gas of ultracold atoms with a desired non-classical spin-correlation function using atom-light interaction of the kind routinely employed in quantum spin polarization spectroscopy. Our method is based on quantum non-demolition (QND) measurement and feedback, and allows in particular to create on demand exponentially or algebraically decaying correlations, as well as a certain degree of multi-partite entanglement.

arXiv comment2 figures

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• Collective dynamics of multimode bosonic systems induced by weak quantum measurement
• Measurement-enhanced determination of BEC phase transitions
• Conditioned quantum motion of an atom in a continuously monitored 1D lattice
• Tuning the universality class of phase transitions by feedback: Open quantum systems beyond dissipation
• Extreme spin squeezing for photons
• Quantum State Reduction by Matter-Phase-Related Measurements in Optical Lattices
• Preparing the spin-singlet state of a spinor gas in an optical cavity