Speaker: Jason Petta
Title: High-fidelity quantum control and readout of spins in silicon
Abstract: Electron spins are excellent candidates for solid-state quantum computing owing to their exceptionally long quantum coherence times [1]. In the past few years, silicon spin qubits have transitioned from basic demonstrations of quantum control to high-fidelity gate operations that may be sufficient to support quantum error correction. I will describe recent experiments where we achieve single-spin initialisation and readout with errors <1%, single-qubit control with a fidelity exceeding 99.95%, and a two-qubit gate with a fidelity of 99.8% [2,3]. These results pave the way for more advanced spin qubit implementations using industrially fabricated silicon quantum devices.
[1] G. Burkard, T. D. Ladd, J. M. Nichol, A. Pan & J. R. Petta. Semiconductor spin qubits. Rev. Mod. Phys. (in press).
[2] A. R. Mills, C. R. Guinn, M. M. Feldman, A. J. Sigillito, M. J. Gullans, M. Rakher, J. Kerckhoff, C. A. C. Jackson & J. R. Petta. High-fidelity state preparation, quantum control, and readout of an isotopically enriched silicon spin qubit. Phys. Rev. Appl. (in review).
[3] A. R. Mills, C. R. Guinn, M. J. Gullans, A. J. Sigillito, M. M. Feldman, E. Nielsen & J. R. Petta. Two-qubit silicon quantum processor with operation fidelity exceeding 99%. Sci. Adv. 8:abn5130 (2022).
Bio: Jason Petta is a professor of physics at UCLA. He received a PhD in physics from Cornell University in 2003. As a postdoctoral fellow at Harvard, Petta had a leading role in a series of experiments demonstrating trapping and detection of single electrons, as well as a seminal experiment demonstrating coherent control of two-electron spin states. Recent advances in Petta’s group include the fabrication of a scalable quantum dot device architecture in silicon, shuttling a single charge down an array of silicon quantum dots, and the demonstration of a high-fidelity two-qubit gate for spins in silicon. Petta’s group has also developed hybrid quantum devices incorporating semiconducting and superconducting elements. Physics breakthroughs include the demonstration of strong coupling of a single charge to a single photon, strong coupling of a single spin to a single photon, and the coupling of two spins separated by 4 mm using microwave-frequency photons.
Professor Petta is a recipient of the Presidential Early Career Award for Scientists and Engineers, a National Science Foundation CAREER Award, the McMillan Award, the American Association for the Advancement of Science Newcomb Cleveland prize, and the Lee–Osheroff–Richardson prize. Petta was a Moore Foundation Experimental Investigator in Quantum Materials from 2014 to 2020. Petta was recently elected as a Fellow of the American Physical Society and Fellow of the American Association for the Advancement of Science.
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