Two-qubit entangling gates within arbitrarily long chains of trapped ions

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Ion trap quantum computers are based on modulating the Coulomb interaction between atomic ion qubits using external forces. However, the spectral crowding of collective motional modes could pose a challenge to the control of such interactions for large numbers of qubits. Here, we show that high-fidelity quantum gate operations are still possible with very large trapped ion crystals by using a small and fixed number of motional modes, simplifying the scaling of ion trap quantum computers. We present analytical work that shows that gate operations need not couple to the motion of distant ions, allowing parallel entangling gates with a crosstalk error that falls off as the inverse cube of the distance between the pairs. We also experimentally demonstrate high-fidelity entangling gates on a fully connected set of seventeen Yb+171 qubits using simple laser pulse shapes that primarily couple to just a few modes.





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Landsman, KA, Y Wu, PH Leung, D Zhu, NM Linke, KR Brown, L Duan, C Monroe, et al. (2019). Two-qubit entangling gates within arbitrarily long chains of trapped ions. Physical Review A, 100(2). 10.1103/PhysRevA.100.022332 Retrieved from

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Norbert Matthias Linke

Assistant Professor of Physics

Kenneth R Brown

Michael J. Fitzpatrick Distinguished Professor of Engineering

Prof. Brown's research interest is the control of quantum systems for both understanding the natural world and developing new technologies. His current research areas are the development of robust quantum computers and the study of molecular properties at cold and ultracold temperatures.

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