Building exotic quantum systems with atoms and photons in low dimensions

Building exotic quantum systems with atoms and photons in low dimensions
Issue Date
Quantum Optics Workshop 2103
, 24-24
Quantum networks are composed of quantum nodes that interact coherently through quantum channels, and open a broad frontier of scientific opportunities1. For example, a quantum network can serve as a ‘web’ for connecting quantum processors for quantum computation and communication, or as a ‘simulator’ allowing investigations of quantum critical phenomena arising from interactions among the nodes mediated by the channels. An exciting frontier in this endeavor is the integration of otherwise ‘simple’ quantum elements into complex quantum networks. In this context, there is active research to achieve lithographic quantum optical circuits, for which atoms are trapped near micro- and nanoscopic dielectric structures and ‘wired’ together by photons propagating through the circuit elements. Single atoms and atomic ensembles endow quantum functionality for otherwise linear, passiveoptical circuit, and, thereby, the capability to build quantum many-body systems component by component. In this talk, I will briefly discuss our results in loading ultracold atoms into a state-insensitive, compensated nanofiber optical trap2, and recent endeavors in the Caltech Quantum Optics Group towards trapping and interfacingsingle photons and atoms in 1D photonic crystal waveguides with band-edge nonlinearity. I will also discuss a physical setting where dissipative many-body entanglement emerges out of equilibrium from optically driven dipole-blockaded lattice gases.3 In particular, we develop a driven-dissipative framework, which selects a decoherence-free subspace by generalized excitation blockade mechanism and induces a coherent XY interaction for spins trapped in the subspace, thereby driving the system to a multipartite entangled steadystate. Such an interaction may be induced between Rydberg atoms, or between trapped atoms in a photonic crystal mediated by virtual photons hopping over the circuit elements.
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