Nature heavy: three major discoveries of silicon materials

Silicon plays an important role in people's production and life
.

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Fidelity refers to how similar the output of an electronic device reproduces the input (sound, video, image, etc.

In response, a research team including Akito Noiri, Center for Emerging Matter Science at RIKEN, developed a new two-qubit system consisting of a stack of silicon and silicon-germanium alloys, in which quantum information is encoded and confined to the electrons of quantum dots.
Spin in
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This research is the first time that spin qubits compete with superconducting circuits and ion traps in general quantum control performance, laying the foundation for the research and development of silicon quantum computers .
The result is "Fast universal quantum gate above the fault-tolerance threshold in silicon" Published in the journal Nature
.

In this regard, Christopher Rogers and other research teams have designed a new all-solid-state 3D CMOS image sensor based on the focal plane theory
.

The silicon photonics system in this paper has unparalleled advantages in long-distance control, which also shows that silicon photonics technology has great research value in lidar integrated systems
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Nuclear spin is the most coherent quantum system state in solids, and its coupling ability with the external environment is very weak.
In the context of quantum information processing, coherence is related to the fidelity of recording single-qubit gates
.
However, how to realize multi-qubit logic operations under weak coupling is still a major research topic
.
In this regard, some researchers have tried to use spin defects in diamond and silicon carbide to couple multiple atomic nuclei to a common nucleus to construct an electron spin system, thereby generating quantum registers that can maintain small quantum logic operations and error correction
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Connecting via photons is an efficient means of constructing electron spin systems
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So far, the use of nuclear spin to generate quantum registers has faced many challenges, such as the need for dense qubits to be integrated to operate in the same semiconductor chip
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This entails physically moving the atoms in nuclear qubits entangled together, and interspersed with spin-readout devices in electron-nuclear quantum processing units
.

In response, the research group of Mateusz T.
Mądzik used a pair of ion-implanted P-donor nuclei in silicon nanoelectronic devices to engineer a general quantum logic operation
.
Nuclear two-qubit controlled gates can be obtained by imparting geometric phase to shared electron spins and used to fabricate entangled Bell states with up to 94.
2% fidelity
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The quantum operating mechanism can be precisely characterized by gate set tomography and produces a qubit average gate with fidelity up to 99.
95%, two-qubit average gate fidelity of 99.
37%, and two-qubit preparation/measurement fidelity Up to 98.
95%
.
These three metrics show that the performance of nuclear spins in silicon can meet the performance standards of quantum processors
.
The research team demonstrated the process of entanglement between two atomic nuclei, sharing electrons by creating a Greenberg-Horn-Zehringer three-qubit with 92.
5 percent fidelity
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Electron spin qubits in this semiconductor can be further coupled to other electronic sensors and physically shuttle to different locations
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The research provides a viable avenue for scalable quantum information
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His research results were published in nature under the title "Precision tomography of a three-qubit donor quantum processor in silicon"
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Outlook: Silicon Photonics - the Core of Future Internet Technology

With the breakthrough of silicon materials in the precise tomography of quantum computers, three-dimensional image sensors and quantum processors, it indicates that silicon photonics technology will gradually become the core of the future Internet industry
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In the future era of big data, the usage of the Internet will continue to grow, and more and more data needs to be transmitted
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The signal transmission performance of the existing equipment has been difficult to meet people's needs
.
For this reason, replacing electronic signals with high-speed communication can greatly improve the efficiency of information transmission, and silicon photonics technology can increase the data transmission rate between processor cores by more than 100 times through the transmission and reception of optical information
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Using large-scale semiconductor manufacturing processes, various silicon photonic devices (modulators, amplifiers, detectors, etc.
) are integrated together, and high-speed drivers, readers, and clock circuits are used to form functional modular systems, which are applied in large-scale super Computers, unmanned systems, radar identification and high-tech military weapons and many other fields
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Therefore, while improving our country's comprehensive national strength, it also greatly improves the people's living standards
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Although silicon photonics technology is still in its infancy in China and faces many challenges, these challenges can always be overcome with the continuous efforts of researchers
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Literature Links

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