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Description
This work investigates a two-ion system based on $^{171}\text{Yb}^+$ ions confined in a microwave (MW) Paul trap at the University of Siegen. The system employs MW-driven control in combination with magnetic gradient-induced coupling (MAGIC). Two continuous microwave fields are applied to the ions, with discrete phase jumps implemented according to a URDD-modulation sequence [1], forming the basis of a dynamically controlled entangling protocol.
Our work’s primary objective is to develop a comprehensive understanding of the mechanisms underlying entanglement generation in this setting. This is achieved through a combination of analytical derivations and numerical simulations, focusing on the emergence of effective interactions between the two qubits.
A central aspect of the analysis is the characterization of stability and robustness of the entangling protocol. The impact of environmental effects, including control imperfections, is investigated to assess the degree of protection provided by the URDD phase jump sequence and different orders are compared to one another. This allows for a detailed comparison between the effectiveness of the Dynamical Decoupling (DD) schemes. We also compare results with prior work employing a different DD scheme in the same setting [2].
In addition, we investigate how MAGIC gives rise to an effective coupling between the ions, and how this coupling is modified by the presence of MW driving fields. Analytical expressions for the coupling strength are derived and benchmarked against experimental data.
[1] Genov, G. et al. (2016). Arbitrarily Accurate Pulse Sequences for Robust Dynamical Decoupling. 10.48550/arXiv.1609.09416.
[2] Nunnerich, M. et al. (2025). Fast, Robust, and Laser-Free Universal Entangling Gates for Trapped-Ion Quantum Computing. Phys. Rev. X, 15, 021079.
| Academic level | Master's Student |
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