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Quantum Materials Science Lab
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The lab turns tiny defects in diamond into quantum sensors and devices.
AboutAbout the lab
Manipulating quantum systems inside diamond.
The Quantum Materials Science Lab (Mizuochi Lab) conducts research using diamond. Diamond contains defects called NV centers, each consisting of a vacancy (a missing carbon atom) paired with a nitrogen atom.
Individual NV centers can be observed optically at room temperature, and their spins can be manipulated and read out at room temperature. They are therefore expected to find applications in ultrasensitive sensors, quantum information devices, and biomarkers.
Key terms
- NV center
- A site in diamond where a hole left by a missing carbon atom (a vacancy) sits next to a nitrogen atom
- Spin
- A property of electrons and other particles that makes them behave like tiny magnets
- Quantum entanglement
- A quantum property in which the states of multiple particles remain linked to one another even when the particles are far apart
ResearchResearch themes
The lab works on quantum sensors based on NV centers in diamond, and on devices for quantum computing and quantum cryptographic communication.
*Illustrative imageDiamond quantum sensors
The lab found that in NV centers in phosphorus-doped n-type diamond, the electron spin coherence time at room temperature becomes longer, and achieved the world's highest magnetic field sensitivity among single-NV-center quantum sensors.
*Illustrative imageWidening the measurable magnetic field range
Using an original algorithm, the lab succeeded in greatly expanding the range of magnetic fields (the dynamic range) that an NV-center quantum sensor can measure at room temperature, while maintaining its sensitivity.
*Illustrative imageSingle photons from a diamond LED
Quantum cryptographic communication that cannot be eavesdropped on requires a light source that emits photons one at a time. The lab was the first in the world to electrically generate photons one at a time at room temperature using a diamond LED.
*Illustrative imageCreating entanglement in solid-state devices
The lab is working on generating entangled states, which play a major role in quantum cryptographic communication and quantum computing, in solid-state devices that use NV centers in diamond as the resource.
MembersFaculty
- ProfessorNorikazu Mizuochi
- Associate ProfessorNaoya Morioka
- Associate ProfessorKyoko Furuita
- Program-Specific Associate ProfessorIzuru Ohki
- Program-Specific Associate ProfessorEi Shigematsu
- Assistant ProfessorTetsuri Nishikawa
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Diamond cuboctahedron” Ludvig14 / CC BY-SA 3.0 (cropped)
- Diamond quantum sensors: “Nitrogen-Vacancy Center” Stacylee14 / CC BY-SA 3.0 (cropped)
- Widening the measurable magnetic field range: “NV center in solid immersion lens” David A. Hopper, Henry J. Shulevitz, Lee C. Bassett / CC BY 4.0 (cropped)
- Single photons from a diamond LED: “Single-Photon Detector ( )” National Institute of Standards and Technology / Public domain (cropped)
- Creating entanglement in solid-state devices: “Quantum Entangled Photon Generator - DEF CON 17 - Aug. 2009” Nate Grigg from Salt Lake / CC BY 2.0 (cropped)
- Related lab (Organic Molecular Materials Lab): “Close UP photo of lg c1 oled” TECH EDU / CC BY-SA 4.0 (cropped)
- Related lab (Transition Metal Complex Chemistry Lab): “- grapes on the vine - 3 strands dangling side by side - (HiRes focus stack)” Franz van Duns / CC BY-SA 4.0 (cropped)
- Related lab (Isotope Utilization Chemistry Lab): “ElementCollection” Scientific29 / CC BY-SA 3.0 (cropped)
- Related lab (Solid State Chemistry Lab): “Copper-hydride-from-xtal-3D-SF” CCoil (talk) / CC BY 3.0 (cropped)
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