期刊
QUANTUM SCIENCE AND TECHNOLOGY
卷 2, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2058-9565/aa5f8d
关键词
quantum computing; fidelity of T-gates; interleaved benchmarking; randomized benchmarking
资金
- US Army Research Office [W911NF-14-1-0098, W911NF-14-1-0103]
- Australian Research Council Centre of Excellence for Engineered Quantum Systems [CE110001013]
- Australian Research Council [FT130101744]
- Australian Research Council [FT130101744] Funding Source: Australian Research Council
Randomized benchmarking is an important protocol for robustly characterizing the error rates of quantum gates. The technique is typically applied to the Clifford gates since they form a group that satisfies a convenient technical condition of forming a unitary 2-design, in addition to having a tight connection to fault-tolerant quantum computing and an efficient classical simulation. In order to achieve universal quantum computing one must add at least one additional gate such as the T. gate (also known as the pi/8 gate). Here we propose and analyze a simple variation of the standard interleaved RB protocol that can accurately estimate the average fidelity of the T. gate while retaining the many advantages of a unitary 2-design and the fidelity guarantees that such a design delivers, as well as the efficient classical simulation property of the Clifford group. Our work complements prior methods that have succeeded in estimating T. gate fidelities, but only by relaxing the 2-design constraint and using a more complicated data analysis.
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