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IMAGE: (a) Encoding quantum circuit of the five-qubit code. (b) Expectation values of 31 stabilizers for the encoded logical state |T> L. (c) Expectation values of logical Pauli operators and state fidelity. view more
Credit: @Science China Press
Universal fault-tolerant quantum computing relies on the implementation of quantum error correction. An essential milestone is the achievement of error-corrected logical qubits that genuinely benefit from error correction, outperforming simple physical qubits. Although tremendous efforts have been devoted to demonstrate quantum error correcting codes with different quantum hardware, previous realizations are limited to be against certain types of errors or to prepare special logical states. It remains one of the greatest and also notoriously difficult challenges to realize a universal quantum error correcting code for more than a decade.
Credit: College of Engineering, Peking University
During 1995-2015, fullerene derivatives had been the dominating electron acceptors in organic solar cells (OSCs) owing to their performance superior to other acceptors. However, the drawbacks of fullerenes, such as weak visible absorption, limited tunability of electronic properties and morphological instability, restrict further development of OSCs toward higher efficiencies and practical applications. Therefore, the development of new acceptors beyond fullerenes is urgent in the field of OSCs.
Professor Zhan Xiaowei from the College of Engineering at Peking University is one of the pioneers engaging in development of nonfullerene acceptors in the world. In 2007, Zhan s group pioneered perylene diimide-based polymer acceptors (
Xi Jinping
On Thursday, China had formally approved the 14th Five-Year Plan (2021-2025), the draft outline of which was passed by the National People’s Congress as it closed its six-day annual session. Among its key projects is the building of a hydropower base on the lower reaches of Yarlung-Zangbo which refers to the section of the river in Tibet just before it enters India in Arunachal Pradesh, a Sichuan-Tibet railway near the Indian border and a push for self-sufficiency in emerging industries such as Artificial Intelligence.
A railway line would also be built from Xigaze in Tibet to Gyirong on the Tibet-Nepal border. Not only that, the FYP put emphasis on access to key border highways including the G219 national highway which runs along the entire length of India-China border in Xinjiang and Tibet. India had announced its concern over the building over four dams on the upper and middle reaches, the first of which was Zangmu that had been operationalized in 2015. Indian o
Genomes in Wild Plant Species may Help Peaches Adapt to Climate Change
A (
BTI), has identified genes that allow peaches and their wild relatives to withstand stressful conditions a discovery that can help domesticated peaches acclimatize to climate change.
A behmi tree (Prunus mira), which is a wild relative of the domesticated peach, grows in its native habitat next to a glacier on the Tibetan Plateau. Image Credit: Yong Li, from Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences.
The research work, which was co-headed by BTI faculty member Zhangjun Fei, analyzed the genes of the wild relatives and landraces of the domesticated peach. Over time, these varieties have adapted to certain local conditions from seven areas in China.