Two-qubit gate protocols with microwave-dressed Rydberg ions in a linear Paul trap
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2024
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866913621883224064 |
|---|---|
| author | Wilkinson, Joseph W. P. Bolsmann, Katrin Guedes, Thiago L. M. Müller, Markus Lesanovsky, Igor |
| author_facet | Wilkinson, Joseph W. P. Bolsmann, Katrin Guedes, Thiago L. M. Müller, Markus Lesanovsky, Igor |
| contents | Ultracold trapped atomic ions excited into highly energetic Rydberg states constitute a promising platform for scalable quantum information processing. Elementary building blocks for such tasks are high-fidelity and sufficiently fast entangling two-qubit gates, which can be achieved via strong dipole-dipole interactions between microwave-dressed Rydberg ions, as recently demonstrated in a breakthrough experiment at https://www.nature.com/articles/s41586-020-2152-9 . We theoretically investigate the performance of three protocols leading to controlled-phase gate operations. Starting from a microscopic description of Rydberg ions in a linear Paul trap, we derive an effective Hamiltonian that faithfully captures the essential dynamics underlying the gate protocols. We then use an optimization scheme to fine-tune experimentally controllable parameters like laser detuning and Rabi frequency to yield maximal gate fidelity under each studied protocol. We show how non-adiabatic transitions resulting from fast laser driving relative to the characteristic time scales of the system detrimentally affect the fidelity. Despite this, we demonstrate that in the realistic scenario of Rydberg ions with finite radiative lifetimes, optimizing the best found gate protocol enables achievement of fidelities as high as $99.25\,\%$ for a gate time of $0.2\,μ\mathrm{s}$. This considerably undercuts entangling gate durations between ground-state ions, for which gate times are typically limited by the comparably slower time scales of vibrational modes. Overall, this places trapped Rydberg ions into the regime where fast high-accuracy quantum computing and eventually quantum error correction become possible. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_13699 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Two-qubit gate protocols with microwave-dressed Rydberg ions in a linear Paul trap Wilkinson, Joseph W. P. Bolsmann, Katrin Guedes, Thiago L. M. Müller, Markus Lesanovsky, Igor Quantum Physics Atomic Physics Ultracold trapped atomic ions excited into highly energetic Rydberg states constitute a promising platform for scalable quantum information processing. Elementary building blocks for such tasks are high-fidelity and sufficiently fast entangling two-qubit gates, which can be achieved via strong dipole-dipole interactions between microwave-dressed Rydberg ions, as recently demonstrated in a breakthrough experiment at https://www.nature.com/articles/s41586-020-2152-9 . We theoretically investigate the performance of three protocols leading to controlled-phase gate operations. Starting from a microscopic description of Rydberg ions in a linear Paul trap, we derive an effective Hamiltonian that faithfully captures the essential dynamics underlying the gate protocols. We then use an optimization scheme to fine-tune experimentally controllable parameters like laser detuning and Rabi frequency to yield maximal gate fidelity under each studied protocol. We show how non-adiabatic transitions resulting from fast laser driving relative to the characteristic time scales of the system detrimentally affect the fidelity. Despite this, we demonstrate that in the realistic scenario of Rydberg ions with finite radiative lifetimes, optimizing the best found gate protocol enables achievement of fidelities as high as $99.25\,\%$ for a gate time of $0.2\,μ\mathrm{s}$. This considerably undercuts entangling gate durations between ground-state ions, for which gate times are typically limited by the comparably slower time scales of vibrational modes. Overall, this places trapped Rydberg ions into the regime where fast high-accuracy quantum computing and eventually quantum error correction become possible. |
| title | Two-qubit gate protocols with microwave-dressed Rydberg ions in a linear Paul trap |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2412.13699 |