Superfluids flow without resistance, a striking quantum many-body phenomenon. Yet even superfluids have their limits - force one just right and vortices will nucleate, a form of quantum viscosity. Forced Bose-Einstein condensates support compressible phonons and incompressible vortices, different pathways for energy transport in turbulent dynamics. We explore turbulent flows in quantum fluids - from dilute gas BECs to analogues such as quantum fluids of light.
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Real quantum systems are not isolated, and contact with the environment causes decoherence. In many-body quantum systems multiple decay channels determine the lifetime of superfluid excitations such as vortices and solitons. These stable excitations can also form during the phase transition to BEC, a process that is also well described by an open systems theory. We explore dissipative mechanisms for excited many-body systems and limits to superfluidity.
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Many-body entanglement is central to quantum phenomena. The interaction of light and matter generates entanglement between photons and atoms, sometimes in the form of useable quantum entanglement created via controlled nonlinear processes. Entanglement can be well understood in quantum phase space, the playground of quantum optics theory. We study measures of entanglement, and entanglement resources for quantum information applications.
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