Japanese Researchers Demonstrate Successful Superconducting Circuit For Qubit Control Within Large-scale Quantum Computer Systems
Insider Brief
- Researchers successfully demonstrated a superconducting circuit that can control many qubits at low temperature.
- The team included members from National Institute of Advanced Industrial Science and Technology (AIST), one of the largest public research organizations in Japan, in collaboration with Yokohama National University, Tohoku University, and NEC Corporation.
- Practical quantum computers need to control the state of a huge number of qubits that operate at low temperature.
PRESS RELEASE — In support of the development of large-scale superconducting quantum computers, researchers with the National Institute of Advanced Industrial Science and Technology (AIST), one of the largest public research organizations in Japan, in collaboration with Yokohama National University, Tohoku University, and NEC Corporation, proposed and successfully demonstrated a superconducting circuit that can control many qubits at low temperature.
To realize a practical quantum computer, it is necessary to control the state of a huge number of qubits (as many as one million) operating at low temperature. In conventional quantum computers, microwave signals for controlling qubits are generated at room temperature and are individually transmitted to qubits at low temperature via different cables. This results in numerous cables between room and low temperature and limits the number of controllable qubits to approximately 1,000.
In this study, a superconducting circuit that can control multiple qubits via a single cable using microwave multiplexing was successfully demonstrated in proof-of-concept experiments at 4.2 K in liquid helium. This circuit has the potential of increasing the density of microwave signals per cable by approximately 1,000 times, thereby increasing the number of controllable qubits significantly and contributing to the development of large-scale quantum computers.
The above results were published in “npj Quantum Information”.
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Matt Swayne
With a several-decades long background in journalism and communications, Matt Swayne has worked as a science communicator for an R1 university for more than 12 years, specializing in translating high tech and deep tech for the general audience. He has served as a writer, editor and analyst at The Quantum Insider since its inception. In addition to his service as a science communicator, Matt also develops courses to improve the media and communications skills of scientists and has taught courses.
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Tohoku University
Tohoku University, also known as Tohokudai, is a Japanese national university situated in Sendai, Miyagi, within the Tōhoku Region of Japan. Founded in 1907, it became the third Imperial University in Japan and was among the initial three Designated National Universities, alongside the University of Tokyo and Kyoto University. Tohoku University holds the Top Type status under the Top Global University Project and has earned the title of the best university in Japan by Times Higher Education since 2020.
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NEC
NEC provides network control platform systems and operating services for operations management, along with equipment for network implementation. NEC's wealth of experience in large-scale network implementation and strong technical capabilities help us contribute to the resolution of social issues by providing safe, reliable, and efficient high-value-added networks for the age of IoT through the creation of value with our clients and business partners.
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