Erasure qubits: Overcoming the $T_1$ limit in superconducting circuits
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2022
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866916420964581376 |
|---|---|
| author | Kubica, Aleksander Haim, Arbel Vaknin, Yotam Brandão, Fernando Retzker, Alex |
| author_facet | Kubica, Aleksander Haim, Arbel Vaknin, Yotam Brandão, Fernando Retzker, Alex |
| contents | The amplitude damping time, $T_1$, has long stood as the major factor limiting quantum fidelity in superconducting circuits, prompting concerted efforts in the material science and design of qubits aimed at increasing $T_1$. In contrast, the dephasing time, $T_ϕ$, can usually be extended above $T_1$ (via, e.g., dynamical decoupling), to the point where it does not limit fidelity. In this article we propose a scheme for overcoming the conventional $T_1$ limit on fidelity by designing qubits in a way that amplitude damping errors can be detected and converted into erasure errors. Compared to standard qubit implementations our scheme improves the performance of fault-tolerant protocols, as numerically demonstrated by the circuit-noise simulations of the surface code. We describe two simple qubit implementations with superconducting circuits and discuss procedures for detecting amplitude damping errors, performing entangling gates, and extending $T_ϕ$. Our results suggest that engineering efforts should focus on improving $T_ϕ$ and the quality of quantum coherent control, as they effectively become the limiting factor on the performance of fault-tolerant protocols. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2208_05461 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Erasure qubits: Overcoming the $T_1$ limit in superconducting circuits Kubica, Aleksander Haim, Arbel Vaknin, Yotam Brandão, Fernando Retzker, Alex Quantum Physics The amplitude damping time, $T_1$, has long stood as the major factor limiting quantum fidelity in superconducting circuits, prompting concerted efforts in the material science and design of qubits aimed at increasing $T_1$. In contrast, the dephasing time, $T_ϕ$, can usually be extended above $T_1$ (via, e.g., dynamical decoupling), to the point where it does not limit fidelity. In this article we propose a scheme for overcoming the conventional $T_1$ limit on fidelity by designing qubits in a way that amplitude damping errors can be detected and converted into erasure errors. Compared to standard qubit implementations our scheme improves the performance of fault-tolerant protocols, as numerically demonstrated by the circuit-noise simulations of the surface code. We describe two simple qubit implementations with superconducting circuits and discuss procedures for detecting amplitude damping errors, performing entangling gates, and extending $T_ϕ$. Our results suggest that engineering efforts should focus on improving $T_ϕ$ and the quality of quantum coherent control, as they effectively become the limiting factor on the performance of fault-tolerant protocols. |
| title | Erasure qubits: Overcoming the $T_1$ limit in superconducting circuits |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2208.05461 |