In recent years, there have been significant progress toward building a practical quantum computer, demonstrating key ingredients such as single-qubit gates and a two-qubit entangling gate. Among various physical platforms for a potential quantum computing processor, a trapped-ion system has been one of the most promising platforms due to long coherence times, high-fidelity quantum gates, and qubit connectivity. However, scaling up the number of qubits for a practical quantum computing faces a core challenge in operating high-fidelity quantum gates under influence from neighboring qubits. In particular, for the trapped-ion system, unwanted quantum crosstalk between qubits and ions’ quantum motional states hinder performing high-fidelity entanglement as the number of ions increases. In this review, we introduce a trapped-ion system and explain how to perform single-qubit gates and a two-qubit entanglement. Moreover, we mainly address theoretical and experimental approaches to achieve high-fidelity and scalable entanglement toward a trapped-ion based quantum computer.
Bibliographical noteFunding Information:
This work was funded by Samsung Research Funding Incubation Center of Samsung Electronics ( SRFC-IT1901-09 ) and by the National Research Foundation of Korea ( 2021M3E4A1038534 , 2022R1A4A2000835 , 2021R1A2C2095527 ).
© 2022 Korean Physical Society
- Quantum computer
- Single qubit gate
- Trapped ions
- Two qubit gate