Mølmer-Sørensen entangling gate for cavity QED systems

Takahashi, Hiroki, Nevado, Pedro and Keller, Matthias (2017) Mølmer-Sørensen entangling gate for cavity QED systems. Journal of Physics B: Atomic, Molecular and Optical Physics, 50. a195501. ISSN 0953-4075

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The Mølmer–Sørensen gate is a state-of-the-art entangling gate in ion trap quantum computing where the gate fidelity can exceed 99%. Here we propose an analogous implementation in the setting of cavity QED. The cavity photon mode acts as the bosonic degree of freedom in the gate in contrast to that played by the phonon mode in ion traps. This is made possible by utilising cavity assisted Raman transitions interconnecting the logical qubit states embedded in a four-level energy structure, making the 'anti-Jaynes–Cummings' term available under the rotating-wave approximation. We identify practical sources of infidelity and discuss their effects on the gate performance. Our proposal not only demonstrates an alternative entangling gate scheme but also sheds new light on the relationship between ion traps and cavity QED, in the sense that many techniques developed in the former are transferable to the latter through our framework.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Amelia Redman
Date Deposited: 20 Dec 2019 08:26
Last Modified: 20 Dec 2019 10:45
URI: http://sro.sussex.ac.uk/id/eprint/88923

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