|장소||#1323(E6-2. 1st fl.)|
|일시||Feb. 1 (Wed.), 2p.m.|
|연사||Dr. Michihisa Yamamoto, Department of Applied Physics, The University of Tokyo|
Quantum electron optics using flying electrons
Dr. Michihisa Yamamoto, Department of Applied Physics, The University of Tokyo
Feb. 1 (Wed.), 2p.m. #1323(E6-2. 1st fl.)
Abstract: Quantum electron optics is a field in which one manipulates quantum states of propagating electrons. Combined with technologies for confining and manipulating single electrons, it allows us to investigate the scattering and interference of electrons in a unit of a single electron. The necessary elements of quantum electron optics experiments include single electron beam splitter, phase shifter, Coulomb coupler, single electron source and detector, spin-orbit path and electron-pair splitter.
In this talk, we present development of some of these elements. The beam splitter and phase shifter are implemented in our original two-path interferometer [1-3]. This interferometer has been shown to be the only reliable system for the measurement of the transmission phase shift of electrons [4,5]. To suppress decoherence induced by the electron-electron interaction and enhance the interference visibility, we recently developed a two-path interferometer of depleted channels, where single electrons are injected by means of surface acoustic waves (SAWs). We also confirmed that a single electron in a static quantum dot (single electron source) can be adiabatically transferred into a SAW-driven moving quantum dot , a necessary ingredient for achieving the high interference visibility of a single flying electron.
Quantum electron optics also targets the manipulation of spins of flying single electrons. We found that the spin information of one or two electrons can be transferred between distant quantum dots, which work as the single electron source and detector, with the fidelity limited only by the spin flips prior to the spin transfer [7,8]. We also realized an electron-pair splitter that can be used to split spin-entangled electrons in a moving dot into different moving dots. Combined with single spin manipulation using the spin-orbit interaction (spin-orbit path) , this splitter should allow for Bell measurement of electron spins.
This work is in collaboration with S. Takada (now at Institut Neel), R. Ito and K. Watanabe at the University of Tokyo, B. Bertrand, S. Hermelin, T. Meunier, and C. Bäuerle at Institut Neel, and A. Ludwig and A. D. Wieck at Ruhr-Universität Bochum.
 M. Yamamoto et al., Nature Nano. 7, 247 (2012)..
 A. Aharony et al., New J. Phys. 16, 083015 (2014).
 T. Bautze et al., Phys. Rev. B 89, 125432 (2014).
 S. Takada et al., Phys. Rev. Lett. 113, 126601 (2014).
 S. Takada et al., Appl. Phys. Lett. 107, 063101 (2015).
 B. Bertrand et al., Nanotechnology 27, 204001 (2016).
 S. Hermelin et al., Nature 477, 435 (2011).
 B. Bertrand et al., Nature Nano. 11, 672 (2016).
 H. Sanada et al., Nature Phys. 9, 280 (2013).
Contact: SunYoung Choi, (email@example.com)
Center for Quantum Coherence in Condensed Matter, KAIST
|공지||2019/03/21 - 5/30||Seminar Room #1323||Dr. Hyangtag Lim (KIST) and etc.||Spring 2019: Physics Seminar Serises|
|공지||2019/02/25 - 06/03||Seminar Room 1501||양용수 교수 (Prof. Yongsoo Yang, KAIST) and etc.||Spring 2019: Physics Colloquium|
|187||October 15 (Mon.), 16:00 PM||#1323, E6-2||Dr. Yongjoo Baek||Universal properties of macroscopic current-carrying systems|
|186||October 11 (Thu.), 16:00 PM||#1323, E6-2||Prof. Joung-Real Ahn||Dirac electrons in a graphene quasicrystal|
|185||Oct. 12 (Fri.), 04:00 PM||E6-2. 1st fl. #1323||Dr. HyungWoo Lee||Direct observation of a two-dimensional hole gas at oxide interfaces|
|184||Oct. 12 (Fri.), 02:30 PM||E6-2. 1st fl. #1323||Dr. Daniel Kyungdeock Park||Quantum Advantage in Learning Parity with Noise|
|183||October 4 (Thu.), 16:00 PM||#1323, E6-2||Prof. Soo Jin Kim||Engineering light absorption in an ultrathin semiconductor metafilm|
|182||September 20 (Thu.), 16:00||#1323, E6-2||Prof. Joo-Hiuk Son||Toward Cancer Treatment Using Terahertz Radiation: Demethylation of Cancer DNA|
|181||September 5 (Wed.), 16:00 PM||#1323, E6-2||Dr. Dirk Wulferding||Shining a light on fractional excitations|
|180||Sep. 4 (Tue), 02:30 PM||E6-2. 2st fl. #2502||Dr. Changmin Lee, MIT||Ultrafast time- and angle-resolved photoemission spectroscopy (tr-ARPES) with extreme ultraviolet laser pulses|
|179||2018년 9월 7일 (금), 3PM||학술문화관 (E9), 2층 양승택 오디토리움||Prof. Martin Head-Gordon, UC Berkeley||Recent developments in density functional theory: From new functionals to the nature of the chemical bond|
|178||August 1, 2018 at 11:00AM||양분순 빌딩 (E16-1) 207호||이대열 교수, 예일대 석좌교수||Future of AI: Is the brain a computer?|
|177||July 26, 2018 at 14:00||Room 5318, KAIST Natural Sciences Lecture Hall(E6).||Manki Kim (Department of Physics, Cornell University)||Inflation in String Theory and Backreaction|
|176||July 27, 2018 at 15:00||Room 5318, KAIST Natural Sciences Lecture Hall(E6).||Dr. Hyejung Kim(Technische University Dresden)||Muon g-2 in the 2HDM and MSSM: comprehensive numerical analysis and absolute maxima|
|175||July 13, 2018 at 14:00||Room 5318, KAIST Natural Sciences Lecture Hall(E6).||Prof. Ian Lewis (The University of Kansas, Department of Physics & Astronomy)||Loop Induced Single Top Partner Production and Decay at the LHC|
|174||Thursday, July 12, 2018 at 17:00||Room 5318, KAIST Natural Sciences Lecture Hall(E6)||Dr. Jae Hyeok Yoo (University of California, Santa Barbara, Department of Physics)||The MilliQan Experiment: Search for Milli-Charged Particles at the LHC|
|173||July 9 (Mon.), 14:00 PM||#1323, E6-2||Prof. Cesar A. Hidalgo, MediaLab, MIT||The principles of collective learning|
|172||June 27 (Wed.), 13:30 PM||#1323, E6-2||Dr. Jung Sik Park||Magnetic reversal of artificial spin ice|
|171||June 22 (Fri.), 04:00 PM||#1323, E6-2||Dr. Daniel Sando||Tuning functional properties of BiFeO3 films using strain and growth chemistry|
|170||July 2. 2018 (Monday) 3:00 PM||Seminar Room (C303), Creation Hall (3F), KAIST Munji Campus||Dr. Peter Winter (Argonne National Laboratory)||High Precision Magnetic Field Measurement for the Muon g-2 Experiment|
|169||2018. 6. 22 10:00am ~ 11:50am||E6-6, Lecture Room 119 (1F)||Prof. Sang Bok Lee, Dept. of Chemistry and Biochemistry, Univ. of Maryland||Success in Research Career|
|168||Jun. 18 (MON), 10:00 AM||E6-2. 2nd fl. #2502||Dr. Thibault VOGT||Rydberg electromagnetically induced transparency and microwave-to-optical conversion using Rydberg atoms|