An optical elevator for precise delivery of cold atoms using an acousto-optical deflector

Abstract

We implement a simple method for fast and precise delivery of ultracold atoms to a microscopic device, i.e. a Fabry–Perot microcavity. By moving a single beam optical dipole trap in a direction perpendicular to the beam axis with an acousto-optical deflector, we transport up to 1 million atoms within 100 ms over 1 cm. Under these conditions, a transport efficiency above 95% is achieved with only minimal heating. The atomic cloud is accurately positioned within the microcavity and transferred into an intra-cavity optical lattice. With the addition of a secondary guiding beam, we show how residual sloshing motion along the shallow axis of the trap can be minimized.

Blockchain-based data management mechanism for virtual power plants

“…The improvement of UHV power transmission capacity, the popularity of distribution network measurement devices, and the support of communication networks. The massive wide-area real-time measurement data acquisition, remote aggregation management and automatic optimal scheduling of generation, demand response and energy storage devices, and multi-VPP converge into a mega-grid platform to realize the unified network-wide scheduling of power generation, the coordinated channel of cross-region and cross-province channel power delivery and the accurate distribution of power purchase and sale demand [21][22]. Under multi-VPP, each VPP externally participates in the power market as a unified power plant, and the blockchain structure is shown in Figure 1.…”

Experimental realization of strong coupling between a cold atomic ensemble and an optical fiber microcavity

“…Cold atoms are commonly prepared by a magneto-optical trap (MOT) and normally cannot be directly formed in such a microcavity instead by transporting atoms from the MOT to the optical cavity. The transport scheme mostly contains two ways of moving the magnetic trap, which uses a movable anti-Helmholz coil pair or a magnetic quadrupole trap [47,48] , and moves through an optical dipole trap, which is achieved by an adjustable lens or an optical conveyor belt using an optical lattice [49][50][51][52] . During the transport process, it is significant to prevent atoms from heating and attain a loading efficiency that gets enough atoms into the optical cavity mode for strong coupling.…”