visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Quantum electron optics using flying electrons

2017.01.26 23:43

Physics 조회 수:2643

날짜 2017-02-01 14:00 
일시 Feb. 1 (Wed.), 2p.m. 
장소 #1323(E6-2. 1st fl.) 
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 [6], 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) [9], 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.

 

[1] M. Yamamoto et al., Nature Nano. 7, 247 (2012)..

[2] A. Aharony et al., New J. Phys. 16, 083015 (2014).

[3] T. Bautze et al., Phys. Rev. B 89, 125432 (2014).

[4] S. Takada et al., Phys. Rev. Lett. 113, 126601 (2014).

[5] S. Takada et al., Appl. Phys. Lett. 107, 063101 (2015).

[6] B. Bertrand et al., Nanotechnology 27, 204001 (2016).

[7] S. Hermelin et al., Nature 477, 435 (2011).

[8] B. Bertrand et al., Nature Nano. 11, 672 (2016).

[9] H. Sanada et al., Nature Phys. 9, 280 (2013).

 

Contact: SunYoung Choi, (sunyoungchoi@kaist.ac.kr)

 

 

Center for Quantum Coherence in Condensed Matter, KAIST

번호 날짜 장소 제목
공지 2022-11-25 11:00  E6-2 #1323  [Update 세미나영상](응집물리 세미나) DMFT+ NRG: From models to real materials, from local to nonlocal correlations
428 2016-04-26 16:00  #1323(1st Floor. E6-2)  Transport spectroscopy for electronic bands in carbon-based nanomaterials with weak-bond contacts
427 2016-11-1 10:30  #1323(E6-2 1st fl.)  Time scale dependent dynamics in InAs/InP quantum dot gain media
426 2016-06-01 16:00  #1323(E6-2 1st fl.)  Laboratory experiments relevant to mesospheric clouds, Saturn’s rings & astrophysical jets
425 2016-10-27 16:00  #1323(E6-2)  Terahertz Metal Optics
424 2016-09-22 15:30  #1323(E6-2, 1st fl.)  Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model
423 2016-09-22 15:30  #1323(E6-2, 1st fl.)  Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model
422 2016-06-16 16:00  #1323(E6-2, 1st fl.)  Quantum information processing using quantum dots and photonic crystal cavities
421 2016-05-31 16:00  #1323(E6-2, 1st fl.)  Understanding 3D tokamak physics towards advanced control of toroidal plasma
420 2016-05-19 16:00  #1323(E6-2, 1st fl.)  Nonlinear/quantum optical effect in silicon nano-photonics
419 2016-05-16 16:00  #1323(E6-2, 1st Fl.)  Tuning microwave cavities with biased nonlinear dielectrics for axion searches
418 2016-12-09 16:00  #1323(E6-2. 1st fl.  Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator
417 2017-03-02 16:00  #1323(E6-2. 1st fl.)  “Progress in the comparison of ARPES to DMFT for d and f strongly correlated electron systems”
» 2017-02-01 14:00  #1323(E6-2. 1st fl.)  Quantum electron optics using flying electrons
415 2016-12-09 13:30  #1323(E6-2. 1st fl.)  Entanglement area law in strongly-correlated systems
414 2016-12-8 16:00  #1323(E6-2. 1st fl.)  Dynamical Resonance between Two Optical Cavities via Optomechanical Oscillator
413 2016-11-29 16:00  #1323(E6-2. 1st fl.)  Symmetry Protected Kondo Metals and Their Phase Transitions
412 2016-11-24 16:00  #1323(E6-2. 1st fl.)  Harmonic oscillator physics with single atoms in a state-selective optical potential
411 2016-11-16 16:00  #1323(E6-2. 1st fl.)  Realizing Haldane Model in Fe-based Honeycomb Ferromagnetic Insulators
410 2016-11-11 16:00  #1323(E6-2. 1st fl.)  Dirac fermions in condensed matters
409 2016-11-11 13:30  #1323(E6-2. 1st fl.)  Bandgap Engineering of Black Phosphorus