visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Quantum electron optics using flying electrons

2017.01.26 23:43

Physics 조회 수:2840

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
362 2022-03-07 16:00  E6, #1501  Climate Physics and Modelling(우리말강의)
361 2022-03-14 16:00  E6, #1501  Quantitative phase imaging and artificial intelligence: label-free 3D imaging, classification, and inference
360 2022-02-28 16:00  E6, #1501  Spin-based training of optical microscopes
359 2022-05-02 16:00  E6, #1501  What can we learn from the history of science and technology?(우리말강의)
358 2022-04-11 16:00  E6, #1501  Emergence of Statistical Mechanics in Quantum Systems
357 2022-05-23 16:00  E6, #1501  Novel electronic transport in topological van der Waals magnets
356 2022-05-09 16:00  E6, #1501  Searching for new electronic properties in correlated material flatland
355 2022-04-04- 16:00  E6, #1501  New paradigms in Quantum Field Theory
354 2022-05-16 16:00  E6, #1501  Design synthetic topological matter with atoms and lights
353 2022-05-30 16:00  E6, #1501  Light manipulation using 2D layered semiconductors
352 2015-10-23 10:30  E6, #1501  How to write a good scientific paper[Open lecture series]
351 2024-03-28 11:00  E6, #2501  Geometric characterization of thermoelectric performance of two-dimensional quadratic band-crossing semimetals
350 2016-03-07 16:00  E6, 1501  Physics Colloquium : 2016 Spring file
349 2015-09-07 16:00  E6, 1501  Physics Colloquium : 2015 Fall file
348 2015-03-09 16:00  E6, 1501  Physics Colloquium : 2015 Spring file
347 2015-09-15 16:00  E6, 1501  Physics Colloquium : 2014 Fall file
346 2014-03-10 16:00  E6, 1501  Physics Colloquium : 2014 Spring file
345 2013-09-09 16:00  E6, 1501  Physics Colloquium : 2013 Fall
344 2013-03-11 16:00  E6, 1501  Physics Colloquium : 2013 Spring
343 2012-04-02 16:00  E6, 1501  A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4