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CAS Key Laboratory of Quantum Information, led by Guo Guangcan, a professor at the University of Science and Technology of China, and CAS Academician of the Chinese Academy of Sciences, made new progresses in the new quantum bit coding. For the first time, Guo Guoping's research group and collaborators in this lab successfully achieved the new electronically controlled encoded quantum bits with good quantum coherence, fast manipulation and strong controllability in the gallium arsenide semiconductor quantum chip. The research results were published on February 25 Published in the "Physical Review Letters".
Like modern computers, "quantum chips" are the "brain" of the future quantum computer. The development of electronic control quantum chips compatible with modern semiconductor processes is one of the important directions for the development of quantum computers. The research team is dedicated to the development of semiconductor quantum chips, ultra-fast quantum circuit diagrams along charge-encoding qubits, and the subsequent implementation of charge-encoding ultrafast universal single-qubit gates [Nature Communications 4, 1401 (2013) Based on the two-quantum-controlled non-logic gates [Nature Communications 6, 7681 (2015)], we continue to explore a new method to prolong the coherence time of the charge-coded bits. The same long coherence of bits enables fast control of qubits and long coherence times, thus addressing the core issue of achieving as much quantum control as possible in bit-coherent time.
Using asymmetric characteristics of the multi-electron orbit of the semiconductor quantum dots, the research team first realized new orbital hybridization of qubits in a gallium arsenide semiconductor system, cleverly combining the fast quantum characterization of qubits with the spin qubit Long coherence features into one, to achieve the "fish" (ultra-fast control) and "bear's paw" (long coherence) have both. The experimental results show that the new qubit is similar to the qubit, which can achieve the ultrafast quantum flip from 0 to 1 in picoseconds, and its quantum coherence is nearly ten times higher than that of the general charge-encoded qubit.
The new multi-electron orbital hybridization method for realizing quantum bit coding and control has strong versatility and is not only applicable to III-V semiconductors, but also to new semiconductors such as SiGe and SiGe semiconductors and even to graphene and TMDS. At the same time, this work provides a new idea to explore the influence of polar phonon and piezoelectric effect on quantum coherence in semiconductors.
Energy level structure and electron orbit filling diagram
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