|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
|59||Feb.17(Wed)~19(Fri), 09:00~11:00AM||Online||Prof. Subir Sachdev (Harvard University)||석학 대중 강연 및 강의 시리즈|
|58||May. 14 (Fri.), 04:00 PM||Online seminar||Dr. Je-Hyung Kim(UNIST)||Spatial and temporal separation of environmental dephasing sources from solid-state quantum emitters|
|57||7월 29일(목) 오후 2시 ~ 오후 4시||Online seminar||Dr. Kunio Kaneta(KIAS)||Gravitationally Induced Dark Sector and Inflationary Dynamics|
|56||Jan.28(Thu), 06:00PM||Online Seminar||Alexandre Zagoskin(Loughborough Univ.)||Quantum metamaterials: concept, theory, prototypes and possible applications|
|55||May. 14 (Fri.), 02:30 PM||Online seminar||Dr. Suyong Jung(KRISS)||Electrically tunable spin valve effect in vertical van-der-Waals magnetic tunnel junctions|
|54||Jun. 11 (Fri.), 02:30 PM||Online seminar||Dr. Jin Woong Cha(KRISS)||Engineering sound waves and vibrations in multi-mode nanomechanical systems|
|53||Jun. 11 (Fri.), 04:00 PM||Online seminar||Dr. Keun Su Kim(Yonsei University)||Pseudogap in surface-doped black phosphorus|
|52||Mar25(Thur), 04:00PM||Online Seminar (Zoom)||Prof. Atsushi Tokiyasu (Tohoku Univ.)||Search for dark matter axion with Rydberg atoms|
|51||Apr. 2 (Fri.), 02:30 PM||Online(Zoom)||Dr. Tae Hyun Kim (SNU)||Quantum computing and entanglement generation using trapped ions and photons|
|50||Nov 17th 12:00 PM||Online(Zoom)||Prof. Qiang Lin (Univ. of Rochester, USA)||Quantum- & Nano-Photonics" 세미나 시리즈|
|49||Apr. 2 (Fri.), 04:00 PM||Online(Zoom)||Dr. Heejun Yang (KAIST)||Van der Waals heterostructures for orbital gating-based phototransistors and electronic spectroscopy|
|48||Nov.26(Thu), 04:00PM||Online(Zoom)||Myung-Ki Kim||2020 가을학기 광학분야 특별세미나(Light Engineering Beyond the Diffraction Limit)|
|47||3 PM, 12 Jun (Wed), 2019||Rm# 1323, E6-2||Dr. Minyoung You||The relation between free and interacting fermionic SPT phases|
|46||8/19 (Mon), 10:00~11:30, 8/22 (Thur), 10:00~11:30||Rm. 1322, E6-2||Nicolas Treps||Tutorials on Multimode Quantum Optics in the Continuous Variable Regime|
|45||2019. 7. 16(화)||Rm. 1323 (E6-2)||Prof. Sidney Nagel||2019 Physics Distinguished Lecture|
|44||August 27 (Tue.), 4:00PM||Rm. 1323, E6||Hiroshi Eisaki||Critical current properties of Fe-based superconductors|
|43||August. 14th (Wed.), 4:00PM,||Rm. 1323, E6||Prof. Nicolas Treps||Quantum Optics, at the heart of quantum metrology and quantum information|
|42||-||RM. 1323, E6-2||Spring 2019: Physics Seminar Serises|
|41||Feb. 25 - Jun 3||Rm. 1501 (E6)||Spring 2019: Physics Colloquium|
|40||January 23, 2019||Rm. C303, Creation Hall (3F), Munji Campus||Mikko Mottonen||Ultrasensitive Microwave Bolometer: Opportunity for Axion Detectors|