Realizing a deterministic source of multipartite-entangled photonic qubits

Jean-Claude Besse (), Kevin Reuer, Michele C. Collodo, Arne Wulff, Lucien Wernli, Adrian Copetudo, Daniel Malz, Paul Magnard, Abdulkadir Akin, Mihai Gabureac, Graham J. Norris, J. Ignacio Cirac, Andreas Wallraff and Christopher Eichler ()
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Jean-Claude Besse: ETH Zurich
Kevin Reuer: ETH Zurich
Michele C. Collodo: ETH Zurich
Arne Wulff: ETH Zurich
Lucien Wernli: ETH Zurich
Adrian Copetudo: ETH Zurich
Daniel Malz: Max-Planck-Institute of Quantum Optics
Paul Magnard: ETH Zurich
Abdulkadir Akin: ETH Zurich
Mihai Gabureac: ETH Zurich
Graham J. Norris: ETH Zurich
J. Ignacio Cirac: Max-Planck-Institute of Quantum Optics
Andreas Wallraff: ETH Zurich
Christopher Eichler: ETH Zurich

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract Sources of entangled electromagnetic radiation are a cornerstone in quantum information processing and offer unique opportunities for the study of quantum many-body physics in a controlled experimental setting. Generation of multi-mode entangled states of radiation with a large entanglement length, that is neither probabilistic nor restricted to generate specific types of states, remains challenging. Here, we demonstrate the fully deterministic generation of purely photonic entangled states such as the cluster, GHZ, and W state by sequentially emitting microwave photons from a controlled auxiliary system into a waveguide. We tomographically reconstruct the entire quantum many-body state for up to N = 4 photonic modes and infer the quantum state for even larger N from process tomography. We estimate that localizable entanglement persists over a distance of approximately ten photonic qubits.

Date: 2020
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DOI: 10.1038/s41467-020-18635-x

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