Liang-You Peng

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.

Sep 3, 2024 | link.aps.org | Lei Geng |XiuLan Liu |Jianing Zhang |Liang-You Peng

We investigate the anomalous photoinduced band renormalization in correlated materials, exemplified by the case of Ta2NiSe5. The manifestation of this anomaly is characterized by the alternating direction of band shift in response to changes in the laser parameters or electron momentum. We attribute the phenomena to the band inversion of the material and the selective excitation of a high-lying flat band, leading to the competition between the Hartree shift and the order collapse.