Quantum control methods for robust entanglement of trapped ions

Valahu, Christophe Henri, Apostolatos, Iason, Weidt, Sebastian and Hensinger, Winfried (2022) Quantum control methods for robust entanglement of trapped ions. Journal of Physics B: Atomic, Molecular and Optical Physics, 52. a204003 1-26. ISSN 0953-4075

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A major obstacle in the way of practical quantum computing is achieving scalable and robust high-fidelity entangling gates. To this end, quantum control has become an essential tool, as it can make the entangling interaction resilient to sources of noise. Nevertheless, it may be difficult to identify an appropriate quantum control technique for a particular need given the breadth of work pertaining to robust entanglement. To this end, we attempt to consolidate the literature by providing a non-exhaustive summary and critical analysis. The quantum control methods are separated into two categories: schemes which extend the robustness to (i) spin or (ii) motional decoherence. We choose to focus on extensions of the σx ⊗ σx Mølmer-Sørensen interaction using microwaves and a static magnetic field gradient. Nevertheless, some of the techniques discussed here can be relevant to other trapped ion architectures or physical qubit implementations. Finally, we experimentally realize a proof-of-concept interaction with simultaneous robustness to spin and motional decoherence by combining several quantum control methods presented in this manuscript.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 27 Sep 2022 12:09
Last Modified: 27 Sep 2022 12:15
URI: http://sro.sussex.ac.uk/id/eprint/108156

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