jap banner
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter UniPHY Group iResearch App Facebook

Journal of Applied Physics / Volume 97 / Issue 10 / PROCEEDINGS OF THE 49TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / New Applications and Instrumentation

J. Appl. Phys. 97, 10R511 (2005); http://dx.doi.org/10.1063/1.1860832 (3 pages)

Magnetic materials for finite-temperature quantum computing

R. Skomski, J. Zhou, A. Y. Istomin, A. F. Starace, and D. J. Sellmyer

Department of Physics and Astronomy and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588

View MapView Map

(Published online 17 May 2005)

The potential use of interacting magnetic nanodots for quantum computing (qubit) operations is investigated by model calculations. The quantum entanglement of the low-lying ferromagnetic states, as quantified by the concurrence, exhibits a resonant peak whose position and width depend on parameters such as dot anisotropy, interdot exchange, and external field gradient. The maximum operation temperature is proportional to the magnetocrystalline anisotropy of the dot material. A specific condition is that the dots are sufficiently small so that the interatomic exchange ensures a coherent magnetization state and quantum coherence at finite temperatures. From a material point of view, there is a quite rigid upper limit of about 100 K, but to avoid decoherence it will be necessary to sacrifice a substantial fraction of this temperature, probably at least one order of magnitude.

© 2005 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. NANODOT ENTANGLEMENT
  3. NANODOT MATERIALS
  4. DISCUSSIONS AND CONCLUSIONS

RELATED DATABASES

To view database links for this article, you need to log in.

KEYWORDS and PACS

Keywords

magnetic materials, nanostructured materials, magnetic anisotropy, quantum entanglement, RKKY interaction, quantum computing, mesoscopic systems

PACS

  • 75.50.Tt

    Fine-particle systems; nanocrystalline materials

  • 75.75.-c

    Magnetic properties of nanostructures

  • 75.30.Gw

    Magnetic anisotropy

  • 75.30.Et

    Exchange and superexchange interactions

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 75.40.Mg

    Numerical simulation studies

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1860832

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    A. Ekert and R. Josza, Rev. Mod. Phys. 68, 733 (1996).

    L. K. Grover, Phys. Rev. Lett. 79, 325 (1997).

    G. Lagmago Kamta and A. F. Starace, Phys. Rev. Lett. 88, 107901 (2002).

    F. Meier, J. Levy, and D. Loss, Phys. Rev. Lett. 90, 047901 (2003).

    R. Skomski, A. Kashyap, Y. Qiang, and D. J. Sellmyer, J. Appl. Phys. 93, 6477 (2003)JAPIAU000093000010006477000001.

    S. Hill and W. K. Wootters, Phys. Rev. Lett. 78, 5022 (1997).

    R. Skomski, A. Y. Istomin, A. F. Starace, and D. J. Sellmyer, Phys. Rev. A70, 062307 (2004).

    K. Kumar, J. Appl. Phys. 63, R13 (1988)JAPIAU000063000006000R13000001.

    R. Skomski, J. Appl. Phys. 91, 8489 (2002)JAPIAU000091000010008489000001.


Figures (4)

Access to article objects (figures, tables, multimedia) requires a subscription; log in to view available files.
(Access to supplementary files, where available, is free for this journal.)



Close

Google Calendar

ADVERTISEMENT

Your Recent History Recent History Help

Recently Viewed

  1. Magnetic materials for finite-temperature quantum computing
  2. Modifications of ZnO thin films under dense electronic excitation
  3. Amorphization and decomposition of scandium molybdate at high pressure
  4. Study of structure and luminescence of CdSe Nanocrystals obtained by ball milling
  5. Electrical characterization of amorphous silicon nanoparticles
Go to AIP Home
Copyright © American Institute of Physics
close