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(From left to right, front row: David, Kai-Mei, Eleni, Susan, Katsuya; second row: Young Chul,
Stephan, Chia-Yu, Bingyang,
Shin’ichi, Yoshi, Third row: Kaoru, Neil, Thaddeus, Kristiaan,
Hiroki) Semiconductor systems provide robust and high-speed single-photon
sources and single-photon detectors at wide wavelength range from visible to
near infrared. A series of experiment have been performed in our group to
generate single photons using a single semiconductor quantum-dot (QD) in
micro-cavities and also single-photon detectors using periodically-poled
Lithium Niobate (PPLN) and silicon avalanche
photodiodes. These components are the key building-blocks for the
applications of quantum key distribution and quantum repeaters. One of the
hottest topics in our group is the donor-bound exciton
system in GaAs substrate. A Zeeman sub-levels of
a bound electron spin state in the system provide metastable
ground states, together with a lowest bound exciton
state, forms a so-called three-level lambda system. The first coherent
population transformation has been performed via coherent Raman process with
a solid-state semiconductor system. 1.
Single Photon
and Entangled-pair Source 4. Coherent
control in Semiconductors 7. Quantum
Computer Architecture B. Quantum
Many-Body Systems and Quantum Simulation
(From left to right, front row: Hui,
Neil, Yoshi, Na Young; second row:
George, Shoko, Shinichi; last Row: Tim, David, Patrik,
Cyrus, Fumiko) Quantum mechanics
is a successful framework to describe statics and
dynamics of individual and ensembles of constituting particles at the atomic
and subatomic levels. It provides microscopic understanding of phenomena in
nature by establishing Hamiltonian of the system and finding out the ground
state properties. It becomes unavoidable to encounter the system ground state
including interactions amongst participating entities; however it is a
daunting and impossible task to handle all degrees of freedom with enormous
numbers of particles exactly. Quantum statistics plays a crucial role to make
a conjunction between macroscopic thermodynamic properties and microscopic
quantities by treating effectively many-body interaction. Here we examine
various systems to observe quantum phase transition in the ground states
arising from fundamental correlations innate in systems via experimental
probes and theoretical tools. In particular, quantum simulation is a distinct
approach to perceive unresolved quantum phenomena since its underlying
philosophy lies on the fact that building
quantum system which emulate other quantum systems not only in solid
state systems but also in atomic physics, quantum optics, quantum chemistry
and so on. This area will provide new insights to assess interesting
questions existent in nature. 1.
Quantum
Statistics in Two-Dimensional Electron Gas Systems 2.
Exciton Polariton
Bose-Einstein Condensation 3.
Tomonaga-Luttinger
Liquid in Carbon Nanotubes 4. Quantum Simulation of Hubbard Models 5.
Quantum
Simulation of Lattice Gauge Models 6.
Quantum Simulation of Spin Models
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Last Update: N. Y. Kim on