Robust 2-Qubit Gates in a Linear Ion Crystal Using a Frequency-Modulated Driving Force
| Autor: | Caroline Figgatt, Christopher Monroe, Norbert M. Linke, Pak Hong Leung, K. A. Landsman, Kenneth R. Brown |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
General Physics and Astronomy Order (ring theory) Quantum Physics Quantum entanglement 01 natural sciences 010305 fluids & plasmas Ion Computer Science::Emerging Technologies Controlled NOT gate Logic gate Qubit 0103 physical sciences Ion trap Atomic physics 010306 general physics Quantum computer |
| Zdroj: | Physical Review Letters. 120 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.120.020501 |
| Popis: | In an ion trap quantum computer, collective motional modes are used to entangle two or more qubits in order to execute multiqubit logical gates. Any residual entanglement between the internal and motional states of the ions results in loss of fidelity, especially when there are many spectator ions in the crystal. We propose using a frequency-modulated driving force to minimize such errors. In simulation, we obtained an optimized frequency-modulated 2-qubit gate that can suppress errors to less than 0.01% and is robust against frequency drifts over $\ifmmode\pm\else\textpm\fi{}1\text{ }\text{ }\mathrm{kHz}$. Experimentally, we have obtained a 2-qubit gate fidelity of 98.3(4)%, a state-of-the-art result for 2-qubit gates with five ions. |
| Databáze: | OpenAIRE |
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