Deterministic generation of two-dimensional multi-photon cluster states
O’Sullivan J, Reuer K, Grigorev A, Dai X, Hernández-Antón A, Muñoz-Arias MH, Hellings C, Flasby A, Colao Zanuz D, Besse JC, Blais A, Malz D, Eichler C, Wallraff A (2025)
Publication Type: Journal article
Publication year: 2025
Journal
Book Volume: 16
Article Number: 5505
Journal Issue: 1
DOI: 10.1038/s41467-025-60472-3
Abstract
Multidimensional cluster states are a key resource for robust quantum communication, measurement-based quantum computing and quantum metrology. Here, we present a device capable of emitting large-scale entangled microwave photonic states in a two dimensional ladder structure. The device consists of a pair of coupled superconducting transmon qubits which are each tuneably coupled to a common output waveguide. This architecture permits entanglement between each transmon and a deterministically emitted photonic qubit. By interleaving two-qubit gates with controlled photon emission, we generate 2 × n grids of time- and frequency-multiplexed cluster states of itinerant microwave photons. We generate states with fidelities above 0.50 for up to eight qubits and, in addition, observe nonzero localizable entanglement for states of up to 16 qubits. We expect the device architecture to be capable of generating a wide range of other tensor network states such as tree graph states, repeater states or the ground state of the toric code, and to be readily scalable to generate larger and higher dimensional states.
Authors with CRIS profile
Involved external institutions
Université de Sherbrooke
Canada (CA)
Eidgenössische Technische Hochschule Zürich (ETHZ) / Swiss Federal Institute of Technology in Zurich
Switzerland (CH)
University of Copenhagen
Denmark (DK)
Canada (CA)
Eidgenössische Technische Hochschule Zürich (ETHZ) / Swiss Federal Institute of Technology in Zurich
Switzerland (CH)
University of Copenhagen
Denmark (DK)
How to cite
APA:
O’Sullivan, J., Reuer, K., Grigorev, A., Dai, X., Hernández-Antón, A., Muñoz-Arias, M.H.,... Wallraff, A. (2025). Deterministic generation of two-dimensional multi-photon cluster states. Nature Communications, 16(1). https://doi.org/10.1038/s41467-025-60472-3
MLA:
O’Sullivan, James, et al. "Deterministic generation of two-dimensional multi-photon cluster states." Nature Communications 16.1 (2025).
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