Based on the relativistic quantum mechanics, we are exploring novel quantum manipulation techniques with precise control of electromagnetic waves, applicable to new information physics and nanophotonics. By taking advantage of the quantum manipulation techniques, we will press forward with advanced researches for ultrafast nanoscopy and quantum information, which contribute to future economic and social activities.

Recent topics / What's new

  • We successfully demonstrated THz-field-induced carrier generation in Bi1-xSbx Dirac electron systems. For more detail, see Phys. Rev. B. (doi.org/10.1103/PhysRevB.98.214302)

  • We demonstrated simultaneous measurements of the complex transmittance and birefringence using left- and right-handed circularly polarized THz pulses. For more detail, see Opt. Exp. (doi.org/10.1364/OE.26.030420)

  • Using a pulse shaping technique with a spatial phase modulator, we could sucsessfully demonstrated ultrafast coherent control of multiple hifh-frequency phonons in wide-gap semiconductor SiC. For more detail, see Appl. Phys. Exp. (doi.org/10.7567/APEX.11.122701)

  • We demonstrated in situ tailoring of single-cycle THz near fields in a tunnel junction using phase-controlled THz-STM, which will offer unprecedented control of electrons for ultrafast atomic-scale electronics and metrology. For more detail, see Nano Letters. (DOI: 10.1021/acs.nanolett.8b02161) Also, please visit https://www.eurekalert.org/pub_releases/2018-10/ynu-sdm101118.phphttps://www.eurekalert.org/pub_releases/2018-10/ynu-sdm101118.php.

  • We successfully demonstrated that single-shot pump-probe imaging spectroscopy enables us to disclose the ferroelectric phonon-polariton dynamics across a wide temperature range from 10 K to 375 K while avoiding the photorefractive effects that appear prominently at low temperatures. For more detail, see J. Appl. Phys. (DOI: 10.1063/1.5021379)

  • Ultrafast electron oscillation and dephasing in a solid-state material have been successfully observed by attosecond light source. For more detail, see Nature Communications. (DOI: 10.1038/s41467-018-03885-7)

  • Professor Hideo Kosaka made a contract of joint research with Sumitomo Electric Industries, Ltd.

  • Koyou Kuramitani (PhD1) in Kosaka/Horikiri lab visited Ulm University in Germany to start joint research with Professor Fedor Jelezko.

  • Yuhei Sekiguchi (PhD2) in Kosaka/Horikiri lab visited Delft Technical University in Nederland to start joint research with Professor Tim Taminiau.

  • We have demonstrated universal holonomic quantum gates over geometric spin qubits with polarised microwaves. For more information, see Nature Communications , 9, 3227 (2018). (DOI: 10.1038/s41467-018-05664-w)

  • We have demonstrated universal holonomic quantum gates over geometric spin qubits with polarised microwaves. For more information, see Optics Letters, 43, 2380-2383 (2018). (DOI: 10.1038/s41467-018-05664-w)

  • We successfully observed a strong bias dependence of the carrier relaxation time in metallic single-walled carbon nanotubes by electrochemical doping of the carriers through ionic liquid, which can be understood by 1D impact ionization processes that change the lifetime due to Pauli blocking. For more detail, see Phys. Rev. B. (DOI: 10.1103/PhysRevB.97.075435)

  • We have demonstrated nanoscale electron manipulation in metals using intense THz electric fields. For more detail, see J. Phys. D. (DOI: 10.1088/1361-6463/aaa8c7)

  • We have demonstrated that single-cycle THz fields provide control over electrons in a scanning tunneling microscope (STM) with a single tunnel junction. For more detail, see Nature Photonics 10, 796 (2016). (DOI: 10.1038/nphoton.2016.205)

  • We have demonstrated novel single-shot high-repetition-rate measurements of ultrafast and terahertz waveforms by only using a long optical fiber, a single photodiode, and an oscilloscope. For more information, see Scientific Reports. 6, 37614 (2016). (DOI: 10.1038/srep37614)

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