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Submicrosecond entangling gate between trapped ions via Rydberg interaction

Zhang, Chi; Pokorny, Fabian; Hennrich, Markus; Li, Weibin; Lesanovsky, Igor; Higgins, Gerard; P�schl, Andreas

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Chi Zhang

Fabian Pokorny

Markus Hennrich

Associate Professor

Gerard Higgins

Andreas P�schl


© 2020, The Author(s), under exclusive licence to Springer Nature Limited. Generating quantum entanglement in large systems on timescales much shorter than the coherence time is key to powerful quantum simulation and computation. Trapped ions are among the most accurately controlled and best isolated quantum systems1 with low-error entanglement gates operated within tens of microseconds using the vibrational motion of few-ion crystals2,3. To exceed the level of complexity tractable by classical computers the main challenge is to realize fast entanglement operations in crystals made up of many ions (large ion crystals)4. The strong dipole–dipole interactions in polarmolecule5 and Rydbergatom6,7 systems allow much faster entangling gates, yet stable state-independent confinement comparable with trapped ions needs to be demonstrated in these systems8. Here we combine the benefits of these approaches: we report a two-ion entangling gate with 700-nanosecond gate time that uses the strong dipolar interaction between trapped Rydberg ions, which we use to produce a Bell state with 78 per cent fidelity. The sources of gate error are identified and a total error of less than 0.2 per cent is predicted for experimentally achievable parameters. Furthermore, we predict that residual coupling to motional modes contributes an approximate gate error of 10−4 in a large ion crystal of 100 ions. This provides a way to speed up and scale up trapped-ion quantum computers and simulators substantially.


Zhang, C., Pokorny, F., Hennrich, M., Li, W., Lesanovsky, I., Higgins, G., & Pöschl, A. (2020). Submicrosecond entangling gate between trapped ions via Rydberg interaction. Nature, 580(7803), 345-349.

Journal Article Type Article
Acceptance Date Jan 27, 2020
Online Publication Date Apr 15, 2020
Publication Date Apr 15, 2020
Deposit Date Jan 27, 2020
Publicly Available Date Oct 16, 2020
Journal Nature
Print ISSN 0028-0836
Electronic ISSN 1476-4687
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 580
Issue 7803
Pages 345-349
Keywords Multidisciplinary
Public URL
Publisher URL
Additional Information Received: 29 August 2019; Accepted: 27 January 2020; First Online: 15 April 2020; : The authors declare no competing interests.


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