Quantum Technology

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The Quantum Technology Institute aims to develop technologies for measuring and controlling quantized physical quantities such as electrons, photons, and phonons, as well as technologies utilizing quantum coherence such as qubit.
These quantum technologies can be applied to various fields such as new measurement standards (Josephson voltage standard, quantum Hall resistance standard, optical lattice clock, etc.), new computers(quantum computers), unencumbered cryptosystems(quantum cryptography), and new electronic device(spin device).
The institute is trying to contribute to securing national competitiveness for the next-generation by developing key technologies in the field of quantum technologies and achieving research excellence.

Director: Dr. Seong-Jai Cho(sjcho@kriss.re.kr)

Its current R&D project include the following subjects :

  • Quantum Metrology Triangle
  • Quantum Candela
  • Optical Lattice Clock
  • Quantum Information & Quantum Computer
  • Spin Convergence Research
  • Emerging Quantum Metrology
  • Quantum Theory
  • Watt Balance
  • SPM (Scanning Probe Microscopy)

Team for

Quantum Metrology Triangle Team

The QMT team (Quantum Metrology Triangle) is trying to realize the quantum current standard based on electron pump, and verify the coherence of SI base unit system. This aim can be achieved by realizing three quantum electrical standards (Josephson voltage standard, quantum Hall resistance standard, and quantum current standard) independently and comparing their output with the uncertainty level of 10-8.

Its current R&D project include the following subjects :

  • • Development of quantum current generation and precision measurement technology using single electron pump
  • • Development of Programmable Josephson voltage standard
  • • Development of graphene-based quantum Hall resistor standard device and array device
  • • Development of Extremely low noise 14 bit low temperature current amplifier
  • • Development of high sensitivity (pV resolution) null temperature sensor

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Quantum Candela Team

The Quantum Candela Team aims to develop measurement technologies for the new definition of SI base unit candela (cd) based on the counting of photon one by one. Single photon source, single photon detector, and high-precision measurement techniques are necessary to achieve this aim. Also necessary is a chip-based system, integrating all the elements in a single chip.

Its current R&D project include the following subjects :

  • • Development of On-demand single photon source
  • • Development of On-demand single photon detector
  • • Development of single photon detector characteristic evaluation technology
  • • Development of single photon control technology
  • • Development of high-dimensional quantum transmission technology
  • • Development of dual direct communication technology

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Scanning Probe Microscopy Team

The Scanning Probe Microscopy Team researches and develops probe-based measurement technologies. By utilizing Scanning Tunneling Microscope (STM) and Atomic Force Microscope (AFM) as main platforms, our researches cover wide range of fields, including atomic-resolution imaging, energy spectroscopy, thermoelectric imaging, and so on.

Its current R&D project include the following subjects :

  • • Development of atomic resolution semiconductor impurity structure and chemical measurement analysis technology using low temperature high magnetic field STM
  • • Development of non-volatile memory technology
  • • Development of atomic resolution thermoelectromagnetism and thermoelectric property measurement and analysis technology using mono-atomic AFM
  • • Development of nanometer scale heat transfer measurement technology using optical pump-probe method

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Optical Lattice Clock Team

The Optical Lattice Clock Team is developing an optical lattice clocks using Yb atom as accurate as one second in 4 billion years. Optical lattice clock is considered to replace the current definition of second by Cs atomic clock in the near future. Our research will give contribution to the redefinition of SI base unit of time “second”.

Its current R&D project include the following subjects :

  • • Cryogenic atomic cooling technology for ytterbium light grating
  • • Ultra-precision spectroscopy and uncertainty evaluation for ytterbium optical lattice clock
  • • Development of ultrafine line width laser for Ytterbium clock transition spectroscopy
  • • Absolute frequency measurement using optical frequency comb

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Spin Convergence Research Team

The Spin Convergence Research Team researches and develops various spin-related physical property measurement technologies such as high-resolution magnetic imaging system and spin dynamics measurement system. Our work will contribute to establish measurement tools for the emerging spin devices and thus help both equipment industry and semiconductor device industry.

Its current R&D project include the following subjects :

  • • Development of spin dynamics / imaging measurement technology
  • • Development of fusion physical property measurement technology
  • • Development of spin physical property control technology
  • • Establishment of spin measurement technology and development of magnetic new material
  • • Standardization of spin physical property measurement technology and development of device evaluation technology

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Quantum Theory Team

The Quantum Theory Team quantifies the physical properties of materials within the framework of the quantum computational theory. Through close collaboration with experimental teams, we will contribute to develop new materials with various functionalities.

Its current R&D project include the following subjects :

  • • Development of solid quantum theory calculation technology (reverse material design, machine learning, action dynamics, multiscale, beyond DFT)
  • • Quantum theory Microscopic measurement of solid atom electronic structure through cooperation between computational science and experimental measurement science
  • • R & D related to measurement standard

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Quantum Information Team

The Quantum Information Team seeks to develop core technologies for quantum computing. We aim to develop superconducting Qubit device to generate, control, and measure the quantum mechanical state.

Its current R&D project include the following subjects :

  • • Superconducting qubit and quantum computing
  • • Single photon detector
  • • Superconducting Josephson device-based quantum amplifier

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Watt Balance Team

The Watt Balance Team develops a Kibble balance to realize the SI base unit of mass, kg, which will be redefined based on the fundamental physical constant h (Planck constant). next generation of kilograms.

Its current R&D project include the following subjects :

  • • Development of Watt Balance
  • • Realization of kilogram using physical constants

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Emerging Quantum Metrology Team

The Emerging Quantum Metrology Team aims to develop a platform technology which can used for high precision measurement of the physical properties of quantum materials and devices. Combining nano-device fabrication facilities and cryogenic equipments, we aim to be a national hub of the emerging quantum measurement science and technology.

Its current R&D project include the following subjects :

  • • Development of low-dimensional semiconductor quantum storage capacitance measurement platform
  • • Development of low-dimensional quantum optical-electrical, electro-mechanical properties measurement platform
  • • Development of new concept quantum devices based on low dimensional quantum materials
  • • Nanodynamics - Development of nano-structured single phonon mode precision measurement platform using nano electron beam complex quantum device
  • • Nanodynamics - Implementation of quantum tomography using high-frequency photon-coupled quantum devices

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