Abstract
The prospect of developing magnetic qubits is discussed. The first part of the article makes suggestions on how to achieve the coherent quantum superposition of spin states in small ferromagnetic clusters, weakly uncompensated antiferromagnetic clusters, and magnetic molecules. The second part of the article deals with mechanisms of decoherence expected in magnetic systems. Main decohering effects are coming from nuclear spins and magnetic fields. They can be reduced by isotopic purification and superconducting shielding. In that case the time reversal symmetry of spin Hamiltonians makes spin-phonon coupling ineffective in destroying quantum coherence.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
H.-K. Lo, S. Popescu, and T. P. Spiller,Introduction to Quantum Computation and Information(World Scientific, 1998).
E. M. Chudnovsky and J. Tejada,Macroscopic Quantum Tunneling of the Magnetic Moment(Cambridge University Press, 1998).
W. Wernsdorfer, E. Bonet Orozco, K. Hasselbach, A. Benoit B. Barbara, N. Demoncy, A. Loiseau, H. Pascard, and D. Mailly, Phys. Rev. Lett.78, 1791 (1997)
E. Bonet, W. Wernsdorfer, B. Barbara, A. Benoit, D. Mailly, and A. Thiaville, Phys. Rev. Lett.83, 4188 (1999).
J. R. Friedman, ME. P. Sarachik, J. Tejada, and R. Ziolo, Phys. Rev. Lett.70, 3830 (1996).
W. Wernsdorfer and R. Sessoli, Science284, 133 (1999).
W. Wersasdorfer, E. Bonet Orozco, K. Hasselbach, A. Benoit, D. Mailly, 0. Ktibo, H. Nakano, and B. Barbara, Phys. Rev. Lett.79, 4014 (1997).
D. D. Awschalom, J. F. Smyth, G. Grinstein, D. P. DiVincenzo, and D. Loss, Phys. Rev. Lett.68, 3092 (1992).
E. del Barco, N. Vernier, J. M. Hernandez, J. Tejada, E. M. Chudnovsky, E. Molins, and G. Bellessa, Europhys. Lett.47, 722 (1999).
W. Wernsdorfer, private communication.
D. A. Gaxanin, J. Phys. A: Math. Gen.24, L61 (1991).
M. Enz and R. Schilling, J. Phys.C19, 1765 (1986).
E. M. Chudnovsky and L. Gunther, Phys. Rev. Lett,60, 611 (1988).
J. L. van Hemmen and A. Sütö, PhysicaB141, 37 (1986).
0. B. Zaslavsky, Phys. Lett.A145, 471 (1990).
E. M. Chudnovsky and J. Friedman, Phys. Rev. Lett., to appear.
D. A. Garanin, E. M. Chudnovsky, and R. Schilling, Phys. Rev.B61, 12204 (2000).
B. Barbara and E. M. Chudnovsky, Phys. Lett.A145, 205 (1990).
E. M. Chudnovsky, J. Magn. Magn. Mat.140–144, 1821 (1995).
A. Abragam and B. Bleaney,Electron Paramagnetic Resonance of Transition Ions(Clarendon-Oxford, 1970).
E. M. Chudnovsky, Phys. Rev. Lett.72, 3433 (1994).
Anupam Garg, Phys. Rev. Lett.70, 1541 (1993)
Anupam Garg,J. Appl. Phys.76, 6168 (1994).
N. V. Prokof’ev and P. C. E. Stamp, J. Phys.: Condens. Matter5, L663 (1993)
N. V. Prokof’ev and P. C. E. Stamp,Rep. Prog. Phys.63, 669 (2000).
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2001 Springer Science+Business Media New York
About this chapter
Cite this chapter
Chudnovsky, E.M. (2001). Quantum Coherence and Decoherence in Magnetic Nanostructures. In: Averin, D.V., Ruggiero, B., Silvestrini, P. (eds) Macroscopic Quantum Coherence and Quantum Computing. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1245-5_19
Download citation
DOI: https://doi.org/10.1007/978-1-4615-1245-5_19
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4613-5459-8
Online ISBN: 978-1-4615-1245-5
eBook Packages: Springer Book Archive