Europhys. Lett.
Volume 69, Number 5, March 2005
Page(s) 699 - 705
Section General
Published online 26 January 2005
Europhys. Lett., 69 (5), pp. 699-705 (2005)
DOI: 10.1209/epl/i2004-10406-0

Single-spin detection by qubit SWAP to a molecular nanomagnet

M. Feng1, 2 and J. Twamley1

1  Department of Mathematical Physics, National University of Ireland Maynooth, Co. Kildare, Ireland
2  Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences Wuhan, 430071, PRC

received 26 May 2004; accepted in final form 22 December 2004
published online 26 January 2005

Spin state detection is a key but very challenging step for any spin-based solid-state quantum computing technology. In fullerene-based quantum computer technologies, we here propose to detect the single spin inside a fullerene by transferring the quantum information from the endohedral spin to the ground states of a molecular nanomagnet $\chem{Fe_{8}}$, with large spin S=10. We show how to perform the required SWAP operation and how to read out the information through state-of-the-art techniques such as micro-SQUID.

03.67.Lx - Quantum computation.
73.21.-b - Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems.

© EDP Sciences 2005