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Researchers solve a foundational problem in transmitting quantum information

Advancement in transmitting quantum information for high-speed information processing
(a) Left panel shows an illustration of our QD-SRR coupled sample. The gap length, L, was designed to be 1μm. The right panel shows a scanning electron microscope image of the QD region. The black crosses represent AuGeNi ohmic contacts. (b) Illustration of the 2DES-SRR-QD coupled model system considered in this Letter. Red and blue lines pictorially represent the quantum Hall edge channels propagating along the SRR when the filling factor of the bulk region is assumed to be 2. "LL1" and "LL2" are the lowest and the second lowest Landau levels, respectively. Credit: Physical Review Letters (2024). DOI: 10.1103/PhysRevLett.132.066901

Future quantum electronics will differ substantially from conventional electronics. Whereas memory in the latter is stored as binary digits, the former is stored as qubits, which can take many forms, such as entrapped electrons in nanostructures known as quantum dots. However, challenges in transmitting this information to anything further than the adjacent quantum dot have limited qubit design.

Now, in a study recently published in Physical Review Letters, researchers from the Institute of Industrial Science at the University of Tokyo are solving this problem, They developed a new technology for transmitting quantum information over perhaps tens to a hundred micrometers. This advance could improve the functionality of upcoming .

How can researchers transmit quantum information, from one quantum dot to another, on the same quantum computer chip? One way might be to convert electron (matter) information into light (electromagnetic wave) information—by generating light–matter hybrid states.

Previous work has been incompatible with the one-electron needs of quantum information processing. Improving on high-speed quantum information transmission in a way that is more flexible in design and is compatible with the semiconductor fabrication tools that are currently available was the goal of the research team's study.

"In our work, we couple a few electrons in the quantum dot to an known as a terahertz split-ring resonator," explains Kazuyuki Kuroyama, lead author of the study. "The design is simple and suitable for large-scale integration."

Previous work has been based on coupling the resonator with an ensemble of thousands to tens of thousands of electrons. In fact, the coupling strength is based on the large size of this ensemble. In contrast, the present system confines only a few electrons, which is suitable for . Nevertheless, both and terahertz electromagnetic waves are confined to an ultra-small area. Therefore, the is comparable in strength to that of many-electron systems.

"We're excited because we use structures that are widespread in advanced nanotechnology—and are commonly integrated into semiconductor manufacturing—to help solve a practical quantum information transmission problem," says Kazuhiko Hirakawa, senior author. "We also look forward to applying our findings to understanding the fundamental physics of light–electron coupled states."

This work is an important step forward in solving a previously vexing problem in transmitting quantum information that has limited applications of laboratory findings. In addition, such light–matter interconversion is regarded as one of the essential architectures for large-scale quantum computers based on semiconductor . Because the researchers' results are based on materials and procedures that are common in semiconductor manufacturing, practical implementation should be straightforward.

More information: Kazuyuki Kuroyama et al, Coherent Interaction of a Few-Electron Quantum Dot with a Terahertz Optical Resonator, Physical Review Letters (2024). DOI: 10.1103/PhysRevLett.132.066901. On arXiv: DOI: 10.48550/arxiv.2204.10522

Citation: Researchers solve a foundational problem in transmitting quantum information (2024, February 13) retrieved 16 April 2024 from
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