함병승(Byoung Seung Ham)

학력

  • 1995 Wayne State University (Ph.D. – Optics)
  • 1993 Wayne State University (M.S. – Optics)
  • 1986 Sogang University (B.S. – Physics)

경력

  • 2013-Present Gwangju Institute of Science and Technology – Professor
  • 2003-2013 Inha University – Professor
  • 2006-Present 교과부 리더연구사업(창의) 단장
  • 1999-2003 ETRI, Senior Researcher
  • 2000-2003 과기부 창의사업단장
  • 1996-1999 MIT, Postdoc

연구분야

  • Quantum Optics and Nonlinear Optics: MOT, Slow/Stop Light, Photon Echoes, NDFWM
  • Quantum Information and Processing: Quantum Memories, Quantum Repeaters, Quantum Interface
  • fs Semiconductor Photonics: Quamtum Coherence Control, All-optical Logic Gates
  • Nano Photonics: NV diamond-based Photonics, Bio-sensors/Bio-imaging, SPP

연구실소개

  • The Center for Photon Information Processing (PIP Center)Estabilished in 2006 by the Korean goverment (Ministry of Science and Technology) via NRF (National Research Foundation) for the highest level of research program in basic research. Total annual research fund is about half million dallars and continues until 2015. The center is located in the first floor of GTI building near the headquarters. The PIP center has four labs; Atomic physics, Rare-earth quantum optics, fs semiconductor photonics, and Quantum Nano-bio.The mian research topics of the PIP cetner are photon logic gates and quantum memories at the speed beyond 100 GHz. The photon logic gate is for the development of a photon CPU in the future, where current electronic CPU has been limited in speed, heat due to current leakage, and fundamentally in quantum mechanics. The success of the photon CPU should be a quantum jump from GHz to THz in computation speed. For the proof of principles, the basic idea has been demonstrated in a rare-earth doped solid by using slow light, where the slow light enhances nonlinearty enormously owing to the extended light-matter interaction time. In the last phase of the PIP center, the slow light will be applied to semiconductor quantum wells, where its coherence swapping time is ~ps leading to THz speed (see PRL 84, 4080 (2000); PRL 88, 023602 (2002)).Recently quantum memory has been drawn much attention to both physicists and photonics engineers, where quantum memory is a key element of quantum computing and used as a building block of distritubed quantum networks. Ultralong quantum memory is essentially required to implement quantum repeaters for long-distance quantum communications. The maximum storage time of quantum memory protocols demonstrated so far is less than one second. To implement quantum repeaters, the required storage time should be far beyond a second. For this, optical locking has been proposed by PIP center (see Nature Photonics 3, 518 (2009)) and experimentally demonstrated in a rear-earth doped solid (see NJP 14, 013003 (2012)) in a non-quantum regime. In the next two years, ultralong quantum memory will be demonstraed in a quantum regime and applied to quantum repeaters. Then long-distance quantum communications will be impleneted.

    For the Quantum nano-bio, NV color centers in diamond have been intensively studied over the last several years. The main applications of NV diamonds are quantum processing such as quantum computing and quantum memories, and quantum nano-bio applications such as tagging, sensing, and imaging. To overcome current storage time limitation in quantum memories, spin echoes have been applied for room temperature ultralong quantum storage. For the quantum nano-bio applications, slow light has been adapted to ultrasound optical tomography (UOT), where the slow light filters noises in time domain and enhances image resolution as well as detection efficiency. Moreover, slow-light nondegenerate four-wave mixing is adventageous in a wide solid angle detection. Nano NV particles may be applied to bio tagging and sensing applications of medical research.

    The PIP center holds various international patents and seminal research papers. From now on global research collaborations will be extended to share our knowledges and techniques and to lead these areas. The PIP center welcomes everyone interested in basic sciences and leading edge technologies.

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