Parallel Assembly of Arbitrary Defect-Free Atom Arrays with a Multitweezer Algorithm

A universal algorithm for defect-free atomic array with arbitrary periodic geometries [Invited]

“…It is common knowledge that moving atoms may cause heating. So most algorithms [8,[20][21][22][23][24][25][26][27][28][29] are searching for the shortest moving distance. In our parallel algorithm, much less steps are needed at the expense of enlarging the moving distance.…”

“…Very recently, Chen et al reported a sorting algorithm with a parallel configuration operated on a field programmable gate array (FPGA) [22] , which no longer needed to wait for the data transfer from the electron multiplying charge coupled device (EMCCD) to the computer CPU. Unfortunately, if the target pattern is not the square lattice, e.g., a triangle lattice, then their approach requires rotating the two-dimensional AOD by using a specific angle [22,23] . Hence, the accuracy of the rotation angle largely affects its performance.…”

Tunnel‐Coupled Optical Microtraps for Ultracold Atoms

“…Another source of entropy associated with probabilistic trap occupation could be effectively eliminated by gray-molasses loading with enhanced loading efficiency [20][21][22][23][24][25] and atom rearrangement to form defect-free arrays via extra mobile tweezers. [13,14] With the recently developed atom rearrangement algorithms, [40,[88][89][90][91][92][93][94][95][96][97] the rearrangement time cost and success rate could be largely improved, allowing the preparation of large-size defect-free atom arrays. The use of cygeonic environment, the vacuum lifetime of a trapped single atom could be further increased to ≈ 6000 s, [98] theoretically allowing the expansion of array size to 10 4 , [96] comparable to the scalability of optical lattices.…”

A Better Production Line for Atom Arrays

“…But their production is often hindered by atom losses that occur during assembly. Now Huanqian Loh and her colleagues at the National University of Singapore have developed an algorithm that limits these losses by speeding up the manufacturing process [1]. They show that their algorithm can be used to make a wide range of pristine arrays containing hundreds of atoms.…”

“…The new algorithm suppresses such losses by limiting how many times the atoms need to be moved while avoiding atom collisions. Using this algorithm, the average number of moves scales as Credit: W. Tian et al [1] the square root of the target array size, unlike conventional methods in which this scaling is at best linear. As a result, at room temperature, the probability that a 225-atom array has zero defects is as high as 33%, which greatly improves on previous demonstrations.…”