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
282 2023-11-16 16:00  E6-2(Natural Science B/D). 1st fl. #1323  Electric-field control of emergent phenomena in correlated oxide thin films
281 2023-11-09 16:00  E6-2(Natural Science B/D). 1st fl. #1323  Assessing the Capability of Near-Term Photonic Devices Towards Quantum Supremacy
280 2016-09-02 14:30  E6-2(1st fl.), #1323  Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction
279 2016-09-02 16:00  E6-2(1st fl) #1323  Quantum Electrical Transport in Topological Insulator Nanowires
278 2022-01-17 14:00  E6-2 Room 2502  Five Lectures on Observational Probes of Dark Energy file
277 2020-11-12 16:00  E6-2 1323  2020 가을학기 광학분야 특별세미나
276 2024-03-20 16:00  E6-2 #2502  [High-Energy Theory Seminar] Black hole states at finite N
275 2024-03-13 16:00  E6-2 #2502  [High-Energy Theory Seminar] The Schwarzschild Black Hole from Perturbation Theory to all Orders
274 2022-10-26 10:00  E6-2 #2502  Replica Higher-Order Topology of Hofstadter Butterflies in Twisted Bilayer Graphene
273 2022-08-08 14:00  E6-2 #2502  Classical Shadow Tomography for Analog Quantum Simulators
272 2023-07-14 11:00  E6-2 #1501  Interfaces engineering of thin film oxides
271 2016-09-29 16:00  E6-2 #1323 (1st floor)  Large-scale Silicon Photonic MEMS Switches
270 2022-11-24 16:00  E6-2 #1323 & Zoom  Probing fundamental physics by mapping the mm and sub-mm sky
269 2023-03-16 16:00  E6-2 #1323  (광학분야 세미나) Investigation of 3D cell mechanics using refractive-index tomography
268 2023-01-09 16:00  E6-2 #1323  Non-Hermitian Hopf-bundle Matter. Moon Jip Park (IBS-PCS)
267 2023-01-10 16:00  E6-2 #1323  Terahertz Spectroscopy of Quantum Materials, Jae Hoon Kim (Yonsei University)
266 2023-03-24 11:00  E6-2 #1323  (응집물리 세미나)Floquet simulators of topological surface states in isolation
265 2022-11-03 13:00  E6-2 #1323  [High-Energy Theory Seminar] Supersymmetric observables via Fermi-gas method
264 2023-04-06 16:00  E6-2 #1323  (광학분야 세미나)Nanophotonics-based approaches to explore Berry physics
263 2023-03-30 16:00  E6-2 #1323  (광학분야 세미나)Scalable quantum entanglement in trapped-ions based quantum computer