HOME > Organization > Division of Information and Quantum Sciences > Department of Quantum Information Photonics
Medical Sciences Research Group
Laboratory site
Staff
Prof. S.TAKEUCHI
Guest Assis. Prof. R. OKAMOTO
Guest Assis. Prof. M. FUJIWARA
Content of research
After a century from the discovery of light quanta by Einstein, the generation of individual single photons and the control of quantum correlation among them are being studied. Such researches will open a new paradigm of ` Science using novel photonic states.’ Typical examples are quantum cryptography realizing ultimate security and quantum computers with which can solve some problems extremely more efficient than conventional computers. Quantum optical measurement which enables super-sensitivity beating the standard quantum limit and quantum lithography with resolution beating the diffraction limit are also studied. In this context, we are studying the following topics.
Quantum Optics: Quantum Electro Dynamics (QED) using light confined in micro/nano structures interacting with individual light emitters toward the realization of new quantum information devices.
Quantum Information and Quantum Metrology: Realization of quantum optical circuits using photons for quantum algorithms, quantum cryptography and quantum optical measurement.
[ Current Research Programs ]
- Optical quantum circuit for quantum information and quantum metrology
- Development of highly-efficient single photon sources, quantum-entangled-photon sources, and highly-efficient single-photon counters
- Quantum cryptography, photonic quantum computer, and optical quantum metrology
- Nano-photonic devices using micro-spheres and nano-optical fiber
- Sciences of Nano-light emitter from the view point of quantum optics
Figure / Graph
Beating the standard quantum limit for the optical phase measurement sensitivity using four entangled photons. Left figure: The two-photon-state pair generator and the ultra-stable photon interferometer. Right figure: One-photon, Two-photon and Four-photon interference results.
Microsphere-resonator coupled with optical nano fiber and transmittance spectrum for different polarization.