Inductively guided circuits for ultracold dressed atoms

Abstract

Recent progress in optics, atomic physics and material science has paved the way to study quantum effects in ultracold atomic alkali gases confined to non-trivial geometries. Multiply connected traps for cold atoms can be prepared by combining inhomogeneous distributions of DC and radio-frequency electromagnetic fields with optical fields that require complex systems for frequency control and stabilization. Here we propose a flexible and robust scheme that creates closed quasi-one-dimensional guides for ultracold atoms through the ‘dressing’ of hyperfine sublevels of the atomic ground state, where the dressing field is spatially modulated by inductive effects over a micro-engineered conducting loop. Remarkably, for commonly used atomic species (for example, 7Li and 87Rb), the guide operation relies entirely on controlling static and low-frequency fields in the regimes of radio-frequency and microwave frequencies. This novel trapping scheme can be implemented with current technology for micro-fabrication and electronic control.

High yield and ultrafast sources of electrically triggered entangled-photon pairs based on strain-tunable quantum dots

“…In contrast, semiconductor QDs are proven candidates for generation of deterministic entangled-photon pairs. In the last decade we have witnessed tremendous advancements in the field, for instance, ultrabright 12 13 and highly indistinguishable polarization-entangled photons 14 and time-bin entangled photons 15 have been demonstrated successfully with semiconductor QDs. Remarkably, a robust and compact entangled-light-emitting-diode (ELED) 16 based on semiconductor QDs has been realized, which represents a significant progress in the field of entangled-photon sources.…”

Trapping Atoms With Radio Frequency Adiabatic Potentials

“…The reasoning followed in this section can then be generalised to any kind of trapping configuration with rf-induced adiabatic potentials. Other trap configurations are reviewed in (Garraway and Perrin 2016), including lattices (Courteille et al 2006, Lin et al 2010, Morgan et al 2011, adiabatic traps combined with optical lattices allowing to reach sub wavelength pe-riods (Lundblad et al 2014, Shotter et al 2008, Yi et al 2008, or using inductively coupled currents (Griffin et al 2008, Pritchard et al 2012, Sinuco-León et al 2014, Vangeleyn et al 2014.…”

Tuning the Drude weight of Dirac-Weyl fermions in one-dimensional ring traps

“…Applications to high-precision measurements, atom interferometry, and quantum information can be envisioned and have spurred the field of "atomtronics" [16,17]. Noticeably, recent advances have made it possible to move towards a strictly 1D regime [18], with optical lattices that can, at least in principle, be added along the ring [19,20], for achieving strong correlations.…”