|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||Sep.22 2022||E6-1 #1323||2022 가을학기 응집물리 및 광학 세미나 전체 일정|
|201||Jan.9 (Wed.), 04:00 PM||E6-2. 2nd fl. #2501||Dr. Heung-Sik Kim||Molecular Mott state in the deficient spinel GaV4S8|
|200||Jan.28(Thu), 06:00PM||Online Seminar||Alexandre Zagoskin(Loughborough Univ.)||Quantum metamaterials: concept, theory, prototypes and possible applications|
|199||Jan.28(Thu), 03:00PM||Zoom||Yaroslav Tserkovnyak (UCLA)||Topological Transport of Deconfined Hedgehogs in Magnets|
|198||JAN. 7 (Mon), 03:00 PM||E6-2. 2st fl. #2501||Dr. Byoung min Kang||Many-Body Invariants for Multipoles in Higher-Order Topological Insulators|
|197||Jan. 26th (Tue), 13:00||E6 #1501||Dr. Hyojin Jung (NIMS)||An Introduction to Cohomology groups|
|196||Jan. 25th (Tue), 15:00||E6 #1501/online||Junhyun Lee (Rutgers, the State University of New Jersey)||Emulating twisted double bilayer graphene with a multiorbital optical lattice|
|195||Jan. 18(Tue), 2pm-3pm||KI bldg. 5th fl. Room B501 & Zoom||YoungJu Jo (Stanford University)||Data-driven interrogation of biological dynamics: from subcellular interactions to neuronal networks in vivo|
|194||Jan. 17(Mon) - 21 (Fri), 2-4pm||E6-2 Room 2502||Dr. Donghui Jeong (Penn State University)||Five Lectures on Observational Probes of Dark Energy|
|193||Jan. 11th(Tue), 15:00||E6 #1501||Soyeun Kim(UIUC)||Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I|
|192||Jan 12th (Wed), 11:00 AM||Zoom and E6 #1323||Joonseok Hur (MIT)||Spectroscopic study of trapped ions towards probing dark matter and new physics|
|191||February 21 (Thu.), 16:00 PM||#5313, E6-2||Prof. Diptimoy Ghosh||B-meson charged current anomalies - Theoretical status|
|190||February 20 (Thu), 4:00 PM||#1323, E6-2||Seunghyun Khim||Unconventional superconductivity in the locally non-centrosymmetric heavy-fermion CeRh2As2|
|189||February 13th (Thur.), 16:30 PM||E6-6, #119||Dr. Seyoon Kim(University of Wisconsin-Madison)||Enhanced Light-Matter Interactions in Graphene with Noble Metal Plasmonic Structures|
|188||February 12(Web.)||E6-2, #5318||Prof. Kunio Kaneta||From inflation to new weak-scale|
|187||Feb.17(Wed)~19(Fri), 09:00~11:00AM||Online||Prof. Subir Sachdev (Harvard University)||석학 대중 강연 및 강의 시리즈|
|186||Feb.15(Mon), 05:00PM||Zoom||Yoshichika Otani(Tokyo Univ.)||Magnetic Cluster Octupole Domain evolutation in chiral antiferromagnets|
|185||Feb. 25 - Jun 3||Rm. 1501 (E6)||Spring 2019: Physics Colloquium|
|184||Feb. 2(Tue) 2:30 PM||Zoom||Prof. Sangsik Kim (Texas Tech University, USA)||Quantum- & Nano-Photonics 세미나(Integrated Nanophotonics with Metamaterials, Microcomb, and Atomic Systems)|
|183||Feb. 12 (Mon), 3:00pm||#C303, (Creation Hall 3F, KAIST Munji Campus)||Dr. Byeongsu Yang, Kamioka Observatory, Univ. of Tokyo||The recent result of XMASS Experiment|
|»||Feb. 1 (Wed.), 2p.m.||#1323(E6-2. 1st fl.)||Dr. Michihisa Yamamoto, Department of Applied Physics, The University of Tokyo||Quantum electron optics using flying electrons|