Defect-Free Assembly of 2D Clusters of More Than 100 Single-Atom Quantum Systems

Abstract

We demonstrate the defect-free assembly of versatile target patterns of up 111 neutral atoms, building on a 361-site subset of a micro-optical architecture that readily provides thousands of sites for single-atom quantum systems. By performing multiple assembly cycles in rapid succession, we drastically increase achievable structure sizes and success probabilities. We implement repeated target pattern reconstruction after atom loss and deterministic transport of partial atom clusters necessary for distributing entanglement in large-scale systems. This technique will propel assembledatom architectures beyond the threshold of quantum advantage and into a regime with abundant applications in quantum sensing and metrology, Rydberg-state mediated quantum simulation, and error-corrected quantum computation.

Ultracold polar molecules as qudits

“…We consider ultracold molecules trapped in the motional ground states of optical tweezers. Tweezers are an established tool for atoms [70][71][72][73][74][75], and have recently been extended to ultracold molecules, both by loading laser-cooled molecules directly into tweezers [76] and by associating atoms in a tweezer to form molecules [48,49]. Tweezers offer single-particle addressability and detection, combined with easy scaling up to arrays of ∼100 traps [73][74][75], making them an ideal platform for quantum computation with ultracold molecules.…”

Arrays of individually controllable optical tweezers based on 3D-printed microlens arrays

“…The high number of mirrors assigned to each lenslet also renders gradual trap depth modulation possible just via deactivating a certain fraction of randomly selected mirrors. Moreover, the present system could be easily extended by an ancillary movable optical tweezer in the manner detailed in [13,18] for the purpose of transporting objects between traps or equipped with parallelized position control as demonstrated in [12,19]. Additionally, our approach is not constrained to two dimensional arrays: Imprinting lenses with a range of different focal lengths makes versatile three-dimensional geometries accessible in a straightforward way.…”

“…Single dielectric particles, biological systems, large atomic ensembles just as individual neutral atom quantum systems can be selected for investigation [7]. Instead of using one single spot, means of acousto optical deflection [8], spatial light modulation [8,9] or implementations based on microlens arrays (MLA) [10,11] already offer tweezer systems consisting of thousands of individually addressable sites [12,13]. While the MLA approach benefits from unprecedented scalability of the trap number there is still demand for a wider range of available geometries, short development cycles in microfabrication combined with the ability for dynamic reconfiguration during operation of the tweezer system.…”

Distinct antiblockade features of strongly interacting Rydberg atoms under a two-color weak excitation scheme

“…Based on the blockade effect, Rydberg atoms can be employed to implement quantum information processing [6,7], quantum registers [8][9][10][11], single-photon sources [12,13] and transistors [14][15][16]. Rydberg atoms are also an ideal platform for investigating excitation transfer [17][18][19][20] and many-body dynamics [21] and implementation of atomic arrays [22,23] beyond the blockade regime.…”