Temporal fusion of entangled resource states from a quantum emitter

Yijian Meng, Carlos F. D. Faurby, Ming Lai Chan, Rasmus B. Nielsen, Patrik I. Sund, Zhe Liu, Ying Wang, Nikolai Bart, Andreas D. Wieck, Arne Ludwig, Leonardo Midolo, Anders S. Sørensen, Stefano Paesani () and Peter Lodahl ()
Additional contact information
Yijian Meng: University of Copenhagen
Carlos F. D. Faurby: University of Copenhagen
Ming Lai Chan: University of Copenhagen
Rasmus B. Nielsen: University of Copenhagen
Patrik I. Sund: University of Copenhagen
Zhe Liu: University of Copenhagen
Ying Wang: University of Copenhagen
Nikolai Bart: Ruhr-Universität Bochum
Andreas D. Wieck: Ruhr-Universität Bochum
Arne Ludwig: Ruhr-Universität Bochum
Leonardo Midolo: University of Copenhagen
Anders S. Sørensen: University of Copenhagen
Stefano Paesani: University of Copenhagen
Peter Lodahl: University of Copenhagen

Nature Communications, 2025, vol. 16, issue 1, 1-6

Abstract: Abstract Fusion-based photonic quantum computing architectures rely on two primitives: i) near-deterministic generation and control of constant-size entangled states and ii) probabilistic entangling measurements (photonic fusion gates) between entangled states. Here, we demonstrate these key functionalities by temporally fusing resource states deterministically generated using a solid-state spin-photon interface. Repetitive operation of the source leads to sequential entanglement generation, whereby curiously entanglement is created between the quantum states of the same spin at two different instances in time. Such temporal multiplexing of photonic entanglement provides a resource-efficient route to scaling many-body entangled systems with photons.

Date: 2025
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DOI: 10.1038/s41467-025-62130-0

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