Quantum information processing architectures that leverage multiple modalities of qubits offer compelling strategies for suppressing qubit errors, performing quantum non-demolition measurements, and executing auxiliary-qubit based quantum protocols. In this talk I will present the latest results from our dual-species atom array composed of individually controlled rubidium and cesium atomic qubits.
First, I will show how a second atomic species can be used to measure and control the primary species. We use an array of cesium qubits to correct correlated phase errors on an array of rubidium data qubits [1]. Rydberg interactions between the two species lead to novel regimes, including greatly enhanced resonant dipole interactions, that we use to demonstrate a 2-qubit gate and quantum non-demolition readout [2].
An alternative, hybrid approach for engineering interactions and scaling these quantum systems is the coupling of atoms to nanophotonic structures in which photons mediate interactions between atoms. Such a system can function as the building block of a large-scale quantum network. In this context, I will present quantum network node architectures that are capable of long-distance entanglement distribution at telecom wavelengths [3] and show how to combine atom-array capabilities with large photonic chips [4].
[1] Singh, Bradley, Anand, Ramesh, White, Bernien, Science 380, 1265 (2023)
[2] Anand, Bradley, White, Ramesh, Singh, Bernien, arXiv:2401.10325 (2024)
[3] Menon, Singh, Borregaard, Bernien NJP 22, 073033 (2020)
[4] Menon, Glachman, Pompili, Dibos, Bernien, arXiv:2311.02153 (2023)