In situ single-atom array synthesis by dynamic holographic optical tweezers

TL;DR

This paper introduces a dynamic holographic optical tweezer technique for in situ assembly of single-atom arrays, enabling deterministic atom placement and rearrangement crucial for scalable quantum systems.

Contribution

It presents a novel method with 2N degrees of freedom for rearranging multiple single atoms simultaneously, improving atom loading and control in quantum applications.

Findings

Successfully rearranged 9 atoms simultaneously

Demonstrated in situ single-atom array assembly

Potential for deterministic atom loading and transport

Abstract

Cooling and trapping of atoms by light has enabled one to build and manipulate quantum systems at the single atom level. Such a bottom-up approach becomes one of the fascinating challenges toward scalable and highly controllable quantum systems, e.g., a large-scale quantum information machine. Their implementation requires crucial pre-requisites: scalablity, site distinguishability, and reliable single-atom loading into sites. The widely adopted methods satisfies the two former conditions relatively well, but the last condition, filling single atoms onto individual sites, relies mostly on the probabilistic loading, implying that loading a pre-defined set of atoms in given positions will be hampered exponentially. Two approaches are readily thinkable to overcome this issue: increasing the single-atom loading efficiency and relocating abundant atoms into unfilled positions. Realizing the relocation is directly related to how many atoms can be transportable in a designer way. Here, we demonstrate a dynamic holographic single-atom tweezers with unprecedented degrees of freedom of 2N. In a proof-of-principle experiment conducted with cold rubidium atoms, simultaneous rearrangements of N=9 single atoms are successfully performed. This method may be further applicable to deterministic N single-atom loading, coherent transport, and controlled collisions.