Demonstration of Cryogenic Dual Species Arrays

Neutral atom arrays provide a powerful platform for quantum computing and simulation, with significant progress in realising programable, high-fidelity operations and initial demonstrations of quantum error correction. To realise fault tolerance on a neutral atom platform it is necessary to be able to perform cross-talk free mid-circuit readout of ancilla qubits. One approach is to use dual-species arrays, which naturally provide a separation in read-out wavelengths to suppress cross-talk between data and ancilla qubits, whilst allowing engineering of strong controllable interspecies couplings for high-fidelity quantum gate operations.

We present a new dual-species tweezer array platform enabling state-selective optical trapping of individual Rubidium and Cesium atoms within a cryogenic environment. We load atoms into arrays within a 7K environment created using a closed-cycle cryostat, and demonstrate enhanced lifetimes enabled by active cryopumping. We will present progress towards d-state Rydberg excitation in this system, with the aim of characterising intraspecies Förster resonances [1] as a pre-cursor to demonstration of high-fidelity multi-qubit gates and ultimately implementing dual-species quantum error-correcting codes.

[1] P. M. Ireland, D. M. Walker, and J. D. Pritchard, Phys. Rev. Research 6, 013293 (2024)