An elementary quantum network of remote ⁸⁸Sr⁺ qubits
ORAL
Abstract
Remote entanglement is an essential resource for many quantum networking protocols. To create entangled states of two remote ⁸⁸Sr⁺ qubits, we first entangle each ion with the polarisation of spontaneously emitted 422 nm photons coupled into single-mode fibres, followed by entanglement swapping using linear optics. To minimise ion micromotion that would reduce photon mode overlap, we develop a simple technique for multi-dimensional stray field compensation without extra laser beams or spatially resolved imaging. We characterise the achieved photonic link performance, which (at 94% Bell state fidelity and an average rate of 182 s⁻¹ [1]) represents the state of the art in high-fidelity remote entanglement across all qubit platforms, and discuss recent progress towards networking applications such as quantum key distribution.
[1] PRL 124, 110501 (2020)
[1] PRL 124, 110501 (2020)
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Publication: L. J. Stephenson, D. P. Nadlinger, et al., "High-rate, high-fidelity entanglement of qubits across an elementary quantum network", Phys. Rev. Lett. 124, 110501 (2020)
Presenters
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David Nadlinger
University of Oxford
Authors
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David Nadlinger
University of Oxford
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Bethan Nichol
University of Oxford
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Peter Drmota
University of Oxford
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Gabriel Araneda
University of Oxford
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Dougal Main
University of Oxford, Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, U.K.
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Raghavendra Srinivas
University of Oxford, University of Colorado, Boulder
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David Lucas
University of Oxford, Department of Physics, University of Oxford
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Christopher Ballance
Department of Physics, University of Oxford, University of Oxford