{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,24]],"date-time":"2026-03-24T06:53:45Z","timestamp":1774335225747,"version":"3.50.1"},"reference-count":36,"publisher":"Association for Computing Machinery (ACM)","issue":"1","license":[{"start":{"date-parts":[[2022,10,21]],"date-time":"2022-10-21T00:00:00Z","timestamp":1666310400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.acm.org\/publications\/policies\/copyright_policy#Background"}],"funder":[{"name":"Office of Science of the U.S. Department of Energy","award":["DE-AC02-05CH11231"],"award-info":[{"award-number":["DE-AC02-05CH11231"]}]}],"content-domain":{"domain":["dl.acm.org"],"crossmark-restriction":true},"short-container-title":["ACM Transactions on Quantum Computing"],"published-print":{"date-parts":[[2023,3,31]]},"abstract":"<jats:p>\n            As the size and complexity of a quantum computer increases, quantum bit (qubit) characterization and gate optimization become complex and time-consuming tasks. Current calibration techniques require complicated and verbose measurements to tune up qubits and gates, which cannot easily expand to the large-scale quantum systems. We develop a concise and automatic calibration protocol to characterize qubits and optimize gates using\n            <jats:italic>QubiC<\/jats:italic>\n            , which is an open source FPGA (field-programmable gate array)-based control and measurement system for superconducting quantum information processors. We propose multi-dimensional loss-based optimization of single-qubit gates and full XY-plane measurement method for the two-qubit CNOT gate calibration. We demonstrate the\n            <jats:italic>QubiC<\/jats:italic>\n            automatic calibration protocols are capable of delivering high-fidelity gates on the state-of-the-art transmon-type processor operating at the Advanced Quantum Testbed at Lawrence Berkeley National Laboratory. The single-qubit and two-qubit Clifford gate infidelities measured by randomized benchmarking are of 4.9(1.1) \u00d7 10\n            <jats:sup>-4<\/jats:sup>\n            and 1.4(3) \u00d7 10\n            <jats:sup>-2<\/jats:sup>\n            , respectively.\n          <\/jats:p>","DOI":"10.1145\/3529397","type":"journal-article","created":{"date-parts":[[2022,4,13]],"date-time":"2022-04-13T11:53:35Z","timestamp":1649850815000},"page":"1-12","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":7,"title":["Automatic Qubit Characterization and Gate Optimization with\n            <i>QubiC<\/i>"],"prefix":"10.1145","volume":"4","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9284-809X","authenticated-orcid":false,"given":"Yilun","family":"Xu","sequence":"first","affiliation":[{"name":"Lawrence Berkeley National Laboratory, Berkeley, CA, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3249-9315","authenticated-orcid":false,"given":"Gang","family":"Huang","sequence":"additional","affiliation":[{"name":"Lawrence Berkeley National Laboratory, Berkeley, CA, USA"}]},{"given":"Jan","family":"Balewski","sequence":"additional","affiliation":[{"name":"Lawrence Berkeley National Laboratory, Berkeley, CA, USA"}]},{"given":"Alexis","family":"Morvan","sequence":"additional","affiliation":[{"name":"Lawrence Berkeley National Laboratory, Berkeley, CA, USA"}]},{"given":"Kasra","family":"Nowrouzi","sequence":"additional","affiliation":[{"name":"Lawrence Berkeley National Laboratory, Berkeley, CA, USA"}]},{"given":"David I.","family":"Santiago","sequence":"additional","affiliation":[{"name":"Lawrence Berkeley National Laboratory, Berkeley, CA, USA"}]},{"given":"Ravi K.","family":"Naik","sequence":"additional","affiliation":[{"name":"University of California at Berkeley, Berkeley, CA, USA"}]},{"given":"Brad","family":"Mitchell","sequence":"additional","affiliation":[{"name":"University of California at Berkeley, Berkeley, CA, USA"}]},{"given":"Irfan","family":"Siddiqi","sequence":"additional","affiliation":[{"name":"University of California at Berkeley, Berkeley, CA, USA"}]}],"member":"320","published-online":{"date-parts":[[2022,10,21]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-019-1666-5"},{"key":"e_1_3_2_3_2","unstructured":"Bayesian information criterion. 2021. 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