1 / 7

QIC 890/891: A tutorial on Nanowires in Quantum Information Processing

QIC 890/891: A tutorial on Nanowires in Quantum Information Processing. Daryoush Shiri , Institute for Quantum Computing (IQC) July 21, 23, 28 and 30, 2014. Agenda. Introduction A crash course on Electronic structure calculation Phonon spectrum Electron-phonon scattering

larue
Download Presentation

QIC 890/891: A tutorial on Nanowires in Quantum Information Processing

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. QIC 890/891: A tutorial onNanowires in Quantum Information Processing DaryoushShiri, Institute for Quantum Computing (IQC) July 21, 23, 28 and 30, 2014

  2. Agenda • Introduction • A crash course on • Electronic structure calculation • Phonon spectrum • Electron-phonon scattering • Spin-Orbit Interaction • Rashba term • Dresselhaus term • Exchange Interaction • Spin relaxation mechanisms • Dyakonov- Perel • Elliot - Yafet • Hyperfine interaction Daryoush Shiri, IQC

  3. Introduction • Electron spin is a natural choice for a Qubit. • Spin of electrons in Quantum Dots (QD). • QDs are defined by potential landscaping on 2DEG. • 2DEG  bandgap engineering in a superlattice. Spin to charge conversion ESR Electric Field (spin-orbit interaction) DaryoushShiri, IQC

  4. Nanowires & QIP • Semiconducting nanowires • A Host for embedding interacting Quantum Dots • Topology-based Q-Computing: Hunt for Majorana Fermions • Emitters of single photon, entangled photons J. Baugh, IQC L. Kouwenhoven, Delft G. Weihs& H. Majedi, et al.

  5. Superconducting nanowires • Detection of single photon (SNPD) NIST See courses offered by: Sir. Anthony Leggett and other faculty members at IQC and Physics on superconductivity

  6. Why nanowires? • Compatibility with mainstream electronic chip industry • As opposed to 2DEG based Qdot systems:  Scalability of Qubits • Embedding many Qdots (spin qubits) • Better electrostatic control (potential landscape) using many gates • Bandgap engineering Fabrication methods (1) Bottom-up methods e.g. VLS (2) Top-down methods • Group III-V (InP, InAs, InSb, GaAs, GaP, AlGaN,….) • Group V (Si/Ge) • Group II-VI (ZnSe/ZnTe) Review article by: J. Ramanujam, D. Shiri, and A. VermaMater. Express 1, 105-126 (2011).

  7. Materials of Choice http://www.ioffe.rssi.ru/SVA/NSM/Semicond/ J. Baugh, IQC InAs InSb m*/m0 = 0.014 µe = 10,000 ~ 30,000 @ base temp (100mK) Lande’ g-factor = 50 m*/m0 = 0.023 µe = 10,000 ~ 30,000 cm2/V.s @ base temp (100mK) Lande’ g-factor = 10 λ MFP ~ 300nm Core-Shell InSb Tandem

More Related