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It is an open challenge to implement a coherent quantum annealer with fully programmable all-to-all connectivity. Here the authors present a scheme based on enhanced Rydberg-dressed interactions between neutral atoms in an optical lattice which is programmable by individual addressing of local fields.
Quantum many-body systems are often so complex as to be intractable. An algorithm that finds the ground state of any one-dimensional quantum system has now been devised, proving that the many-body problem is tractable for quantum spin chains.
The old adage that you can't tango alone is certainly true for humans. But recent experiments show that it may also be applicable to Rydberg atoms, which keep a beat through the coherent exchange of energy.
Accessing orbital exchange between highly symmetric many-component spins may hold the key to a number of exotic, strongly correlated quantum phenomena, but probing such exchange is far from easy. An experiment with ultracold gases takes on the task.