Sheng-Chen Liu

Sep 10, 2024 | link.aps.org | Sheng-Chen Liu |Lin Cheng |Beijing Academy |Liang-You Peng

In the presence of physical noise of all platforms for quantum computation, quantum error correction (QEC) becomes a critical way to realize quantum algorithms with large quantum volumes. In order to understand the influence of quantum noise on QEC codes and further improve the performance of logical circuits, the noises should be accurately analyzed with proper models. Here we focus on the trapped-ion system.

Sep 10, 2024 | link.aps.org | Lin Cheng |Beijing Academy |Sheng-Chen Liu |Liang-You Peng

The ability to perform entangling operations in parallel with a low error is essential for a large-scale fault-tolerant quantum computer. However, for trapped-ion systems, it is a challenging task due to the crosstalk resulting from the collective motional modes. Here, we develop a highly paralleled quantum circuit demonstrating a logical qubit based on the Steane code and study the impact of the crosstalk error on the performance of the fault-tolerant protocol.

Apr 24, 2023 | link.aps.org | Lin Cheng |Beijing Academy |Lei Geng |Sheng-Chen Liu

Abstract To implement a scalable and fault-tolerant programmable quantum computing architecture, the realization of high-fidelity, robust, and efficient quantum entangling gates in a multiqubit system is an essential requirement. In this paper, we consider the optimization of the segmented amplitude-modulated entangling gates realized by applying spin-dependent forces to a chain of ions trapped in a hybrid quadratic and quartic potential.