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Abstract
Electron charge qubits are compelling candidates for solid-state quantum computing because of their inherent simplicity in qubit design, fabrication, control and readout. However, electron charge qubits built on conventional semiconductors and superconductors suffer from severe charge noise that limits their coherence time to the order of one microsecond. Here we report electron charge qubits that exceed this limit, based on isolated single electrons trapped on an ultraclean solid neon surface in a vacuum. Quantum information is encoded in the motional states of an electron that is strongly coupled with microwave photons in an on-chip superconducting resonator. The measured relaxation and coherence times are both on the order of 0.1 ms, surpassing all existing charge qubits and rivalling state-of-the-art superconducting transmon qubits. The simultaneous strong coupling of two qubits with a common resonator is also demonstrated, as the first step towards two-qubit entangling gates for universal quantum computing.
Individual electrons trapped on the surface of solid neon can operate as charge qubits with very long coherence times.
Details
; Chen, Qianfan 2 ; Koolstra, Gerwin 3
; Yang, Ge 4 ; Dizdar, Brennan 5 ; Huang, Yizhong 6
; Wang, Christopher S. 5 ; Han, Xu 1
; Zhang, Xufeng 7
; Schuster, David I. 8
; Jin, Dafei 9
1 Argonne National Laboratory, Center for Nanoscale Materials, Lemont, USA (GRID:grid.187073.a) (ISNI:0000 0001 1939 4845); University of Chicago, Pritzker School of Molecular Engineering, Chicago, USA (GRID:grid.170205.1) (ISNI:0000 0004 1936 7822)
2 Argonne National Laboratory, Center for Nanoscale Materials, Lemont, USA (GRID:grid.187073.a) (ISNI:0000 0001 1939 4845)
3 Lawrence Berkeley National Laboratory, Computational Research Division, Berkeley, USA (GRID:grid.184769.5) (ISNI:0000 0001 2231 4551)
4 The NSF AI Institute for Artificial Intelligence and Fundamental Interactions, Cambridge, USA (GRID:grid.510603.1); Massachusetts Institute of Technology, Computer Science and Artificial Intelligence Laboratory, Cambridge, USA (GRID:grid.116068.8) (ISNI:0000 0001 2341 2786)
5 University of Chicago, James Franck Institute and Department of Physics, Chicago, USA (GRID:grid.170205.1) (ISNI:0000 0004 1936 7822)
6 University of Chicago, Pritzker School of Molecular Engineering, Chicago, USA (GRID:grid.170205.1) (ISNI:0000 0004 1936 7822)
7 Northeastern University, Department of Electrical and Computer Engineering, Boston, USA (GRID:grid.261112.7) (ISNI:0000 0001 2173 3359)
8 University of Chicago, Pritzker School of Molecular Engineering, Chicago, USA (GRID:grid.170205.1) (ISNI:0000 0004 1936 7822); University of Chicago, James Franck Institute and Department of Physics, Chicago, USA (GRID:grid.170205.1) (ISNI:0000 0004 1936 7822); Stanford University, Department of Applied Physics, Stanford, USA (GRID:grid.168010.e) (ISNI:0000 0004 1936 8956)
9 Argonne National Laboratory, Center for Nanoscale Materials, Lemont, USA (GRID:grid.187073.a) (ISNI:0000 0001 1939 4845); University of Chicago, Pritzker School of Molecular Engineering, Chicago, USA (GRID:grid.170205.1) (ISNI:0000 0004 1936 7822); University of Notre Dame, Department of Physics and Astronomy, Notre Dame, USA (GRID:grid.131063.6) (ISNI:0000 0001 2168 0066)