期刊
PHYSICAL REVIEW LETTERS
卷 126, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.210504
关键词
-
资金
- Advanced Scientific Computing Research for Basic Energy Sciences program, Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
The study demonstrates extensions of industry standard randomized benchmarking (RB) protocols for ternary quantum logic, allowing for the evaluation of performance. Testing using a superconducting five-level processor revealed the average infidelity of a single-qutrit process, characterizing relevant gates through interleaved RB, and evaluating a two-qutrit gate using cycle benchmarking.
Ternary quantum processors offer significant potential computational advantages over conventional qubit technologies, leveraging the encoding and processing of quantum information in qutrits (three-level systems). To evaluate and compare the performance of such emerging quantum hardware it is essential to have robust benchmarking methods suitable for a higher-dimensional Hilbert space. We demonstrate extensions of industry standard randomized benchmarking (RB) protocols, developed and used extensively for qubits, suitable for ternary quantum logic. Using a superconducting five-qutrit processor, we find an average single-qutrit process infidelity of 3.8 x 10(-3). Through interleaved RB, we characterize a few relevant gates, and employ simultaneous RB to fully characterize crosstalk errors. Finally, we apply cycle benchmarking to a two-qutrit CSUM gate and obtain a two-qutrit process fidelity of 0.85. Our results present and demonstrate RB-based tools to characterize the performance of a qutrit processor, and a general approach to diagnose control errors in future qudit hardware.
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