Silvano De Franceschi

Talk title
Long life to holes!
Abstract Invited

B. Brun1, S. Zihlmann1, N. Piot1, C. Yu1, V. Schmitt1, J.C. Abadillo-Uriel2, V. P. Michal2, H. Niebojewski3, B. Bertrand3, L. Hutin3, M. Vinet3, M. Filippone2, Y.-M. Niquet2, E. Dumur1, X. Jehl1, R. Maurand1, and S. De Franceschi1

1Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG-PHELIQS-LaTEQS, Grenoble, France 
2Univ. Grenoble Alpes, CEA, IRIG-MEM-L_Sim, Grenoble, France
3Univ. Grenoble Alpes, CEA, LETI, Minatec Campus, F-38000 Grenoble, France 

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Owing to their intrinsic spin-orbit coupling, hole spin qubits are responsive to electric field excitation. This can allow for efficient electrically-driven spin control as well as for spin cavity quantum electrodynamics, thereby opening interesting prospects for qubit control, readout, and long-range coupling. Spin-electric susceptibility, however, renders hole qubits generally vulnerable to electrical noise, which limits their coherence time. Here we investigate the coherence properties of a single hole electrostatically confined in a natural silicon metal-oxide-semiconductor device made using an industry-compatible fabrication process. By varying the magnetic field orientation, we reveal the existence of operation sweet spots where the impact of charge noise is minimized while preserving an efficient electric-dipole spin control. We correspondingly observe an extension of the Hahn-echo coherence time up to 88 μs, exceeding by an order of magnitude the best reported values for hole- spin qubits, and approaching the state-of-the-art for electron-spin qubits with synthetic spin-orbit coupling in isotopically-purified silicon. This finding largely enhances the prospects of silicon-based hole spin qubits for scalable quantum information processing.

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