Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session F01: Poster Session I (4:00pm-6:00pm PT)
4:00 PM,
Tuesday, June 6, 2023
Room: Exhibit Hall C
Abstract: F01.00041 : Quantum networking with trapped 88Sr+ and 43Ca+ ions
Presenter:
Peter Drmota
(University of Oxford)
Authors:
Peter Drmota
(University of Oxford)
David P Nadlinger
(University of Oxford)
bethan C nichol
(University of Oxford)
Dougal Main
(The University of Oxford)
Ellis M Ainley
(University of Oxford)
Chris J Ballance
(University of Oxford)
Raghavendra Srinivas
(University of Oxford/Oxford Ionics)
Gabriel Araneda
(University of Oxford)
David M Lucas
(University of Oxford)
We create entanglement between ions – the stationary quantum memory – and photons – the flying quantum information carrier. By interfering the photons from two network nodes separated by 2 m, we can create remote entangled states of two Sr ions with a 0.94 fidelity at an average rate of 182 s-1 [1].
This remote entanglement has enabled the distribution of a key with security certified by Bell's theorem [2]. The same setup has been used to demonstrate a network of entangled optical atomic clocks, where the remote entanglement enables frequency comparisons with precision close to the Heisenberg limit [3].
More recently, we have integrated a long-lived memory qubit into one node of the quantum network. By transferring the quantum information from Sr to a Ca ion ~3 μm away, we can store ion-photon entanglement for up to 10 s, while concurrent manipulation of Sr does not affect the memory qubit [4].
These mixed-species operations enabled the first demonstration of deterministic and verifiable blind quantum computing through adaptive polarisation measurements. We discuss the next steps for this elementary mixed-species trapped-ion quantum network.
[1] Stephenson et al., Phys. Rev. Lett. 124, 110501 (2020)
[2] Nadlinger et al., Nature 607, 682–686 (2022)
[3] Nichol et al., Nature 609, 689–694 (2022)
[4] Drmota et al., arXiv:2210.11447 (2022)
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