The group headed by Feng Liu from Zhejiang University in Hangzhou, together with a group led by Dr. Arne Ludwig from Ruhr University Bochum and other scientists from China and the UK, report their findings in the journal Nature Nanotechnology, released online on July 24, 2023.
Scientists have successfully created a quantum superposition state within a semiconductor nanostructure that may serve as a basis for quantum computing. The technique: two optical laser pulses that act as a single terahertz laser pulse.
Utilizing the Radiative Auger Process.
To achieve this superposition state, the scientists used the radiative Auger shift. In 2021, a group of scientists was successful for the first time in specifically promoting the radiative Auger shift in a semiconductor.
In the present task, the researchers showed that the radiative Auger procedure can be coherently driven: they utilized two various laser beams with intensities in a particular ratio to each other. With the very first laser, they thrilled an electron-hole pair in the quantum dot to create a quasiparticle including two holes and an electron. With a second laser, they set off the radiative Auger procedure to raise one hole to a series of greater energy states.
Production of Quantum Superposition.
The researchers utilized carefully tuned laser pulses to produce a superposition in between the hole ground state and the greater energy state. The hole therefore existed in both states at the same time. Such superpositions are the basis for quantum bits, which, unlike standard bits, exist not just in the states “0” and “1,” however also in superpositions of both.
Hans-Georg Babin produced the high-purity semiconductor samples for the experiment at Ruhr University Bochum under the supervision of Dr. Arne Ludwig at the Chair for Applied Solid State Physics headed by Professor Andreas Wieck. While doing so, the researchers increased the ensemble homogeneity of the quantum dots and ensured the high pureness of the structures produced. These procedures assisted in the performance of the experiments by the Chinese partners dealing with Jun-Yong Yan and Feng Liu.
Referral: “Coherent control of a high-orbital hole in a semiconductor quantum dot” by Jun-Yong Yan, Chen Chen, Xiao-Dong Zhang, Yu-Tong Wang, Hans-Georg Babin, Andreas D. Wieck, Arne Ludwig, Yun Meng, Xiaolong Hu, Huali Duan, Wenchao Chen, Wei Fang, Moritz Cygorek, Xing Lin, Da-Wei Wang, Chao-Yuan Jin and Feng Liu, 24 July 2023, Nature Nanotechnology. DOI: 10.1038 / s41565-023-01442-y.
The research study was funded by the National Natural Science Foundation of China (funding codes 62075194, 61975177, U21A6006, U20A20164, 62122067), the Fundamental Research Funds for the Central Universities (2021QNA5006), the Federal Ministry of Education and Research (16KISQ009) and the German Research Foundation (DFH/UFA CDFA-05-06).
Scientists have produced a quantum superposition state within a semiconductor nanostructure, a considerable improvement for quantum computing. Utilizing a special energy shift, the researchers developed a superposition state in a quantum dot– a tiny area of the semiconductor– in which an electron hole concurrently possessed 2 different energy levels. Such superposition states are basic for quantum computing.
Researchers have successfully created a quantum superposition state within a semiconductor nanostructure that might serve as a basis for quantum computing. Such superpositions are the basis for quantum bits, which, unlike conventional bits, exist not only in the states “0” and “1,” however also in superpositions of both.
Researchers have actually developed a quantum superposition state within a semiconductor nanostructure, a significant improvement for quantum computing. By utilizing 2 carefully adjusted optical laser pulses, they assisted in a special energy shift, forming a quantum bit within a semiconductor nanostructure. (Artists idea.).
A German-Chinese research study team has actually effectively developed a quantum superposition state in a semiconductor nanostructure, marking a significant advancement for quantum computing. Achieved through using two particularly calibrated short-wavelength optical laser pulses, the team had the ability to generate a quantum bit, or qubit, in a semiconductor nanostructure.
A German-Chinese research study team has actually successfully developed a quantum bit in a semiconductor nanostructure. Using an unique energy transition, the researchers produced a superposition state in a quantum dot– a tiny location of the semiconductor– in which an electron hole at the same time had two different energy levels. Such superposition states are basic for quantum computing.
Previously, the induction of such a state demanded a massive, free-electron laser capable of giving off light in the terahertz range. Unfortunately, this wavelength was too long to precisely focus the beam on the quantum dot. This group, nevertheless, achieved the excitation with two thoroughly calibrated, short-wavelength optical laser pulses.
