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Integrated information storage and transfer with a coherent magnetic device.

Jia N, Banchi L, Bayat A, Dong G, Bose S - Sci Rep (2015)

Bottom Line: Quantum systems are inherently dissipation-less, making them excellent candidates even for classical information processing.The proposed mechanism can be realized with different setups.We specifically show that molecular magnets, as the most promising technology, can implement hundreds of operations within their coherence time, while adatoms on surfaces probed by a scanning tunneling microscope is a future possibility.

View Article: PubMed Central - PubMed

Affiliation: State key laboratory of precision spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China.

ABSTRACT
Quantum systems are inherently dissipation-less, making them excellent candidates even for classical information processing. We propose to use an array of large-spin quantum magnets for realizing a device which has two modes of operation: memory and data-bus. While the weakly interacting low-energy levels are used as memory to store classical information (bits), the high-energy levels strongly interact with neighboring magnets and mediate the spatial movement of information through quantum dynamics. Despite the fact that memory and data-bus require different features, which are usually prerogative of different physical systems--well isolation for the memory cells, and strong interactions for the transmission--our proposal avoids the notorious complexity of hybrid structures. The proposed mechanism can be realized with different setups. We specifically show that molecular magnets, as the most promising technology, can implement hundreds of operations within their coherence time, while adatoms on surfaces probed by a scanning tunneling microscope is a future possibility.

No MeSH data available.


Related in: MedlinePlus

The second order asymmetry term in the effective data-bus Hamiltonian.In the presence of in-plane anisotropy (i.e. E > 0) the spin exchange couplings  and  become asymmetric in the x and y directions, as given in the effective Hamiltonian of Eq. (8). The origin of this asymmetry is a second order process through which the action of in-plane anisotropy  (or its conjugate ) followed by the operation of the usual spin exchange  results in a term like  (or equivalently ) in the effective Hamiltonian of the high-energy subspace. We show the states (a) , (b) , (c) , which are populated during the third order process.
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f4: The second order asymmetry term in the effective data-bus Hamiltonian.In the presence of in-plane anisotropy (i.e. E > 0) the spin exchange couplings and become asymmetric in the x and y directions, as given in the effective Hamiltonian of Eq. (8). The origin of this asymmetry is a second order process through which the action of in-plane anisotropy (or its conjugate ) followed by the operation of the usual spin exchange results in a term like (or equivalently ) in the effective Hamiltonian of the high-energy subspace. We show the states (a) , (b) , (c) , which are populated during the third order process.

Mentions: As it is evident from the above formulae, Jx = Jy = J to the zeroth order, while there is a first order anisotropy in the xy plane caused by the crystal field anisotropy E. The origin of this effective anisotropy is schematically explained in Fig. 4 in which one state in the low energy subspace is virtually populated.


Integrated information storage and transfer with a coherent magnetic device.

Jia N, Banchi L, Bayat A, Dong G, Bose S - Sci Rep (2015)

The second order asymmetry term in the effective data-bus Hamiltonian.In the presence of in-plane anisotropy (i.e. E > 0) the spin exchange couplings  and  become asymmetric in the x and y directions, as given in the effective Hamiltonian of Eq. (8). The origin of this asymmetry is a second order process through which the action of in-plane anisotropy  (or its conjugate ) followed by the operation of the usual spin exchange  results in a term like  (or equivalently ) in the effective Hamiltonian of the high-energy subspace. We show the states (a) , (b) , (c) , which are populated during the third order process.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4561894&req=5

f4: The second order asymmetry term in the effective data-bus Hamiltonian.In the presence of in-plane anisotropy (i.e. E > 0) the spin exchange couplings and become asymmetric in the x and y directions, as given in the effective Hamiltonian of Eq. (8). The origin of this asymmetry is a second order process through which the action of in-plane anisotropy (or its conjugate ) followed by the operation of the usual spin exchange results in a term like (or equivalently ) in the effective Hamiltonian of the high-energy subspace. We show the states (a) , (b) , (c) , which are populated during the third order process.
Mentions: As it is evident from the above formulae, Jx = Jy = J to the zeroth order, while there is a first order anisotropy in the xy plane caused by the crystal field anisotropy E. The origin of this effective anisotropy is schematically explained in Fig. 4 in which one state in the low energy subspace is virtually populated.

Bottom Line: Quantum systems are inherently dissipation-less, making them excellent candidates even for classical information processing.The proposed mechanism can be realized with different setups.We specifically show that molecular magnets, as the most promising technology, can implement hundreds of operations within their coherence time, while adatoms on surfaces probed by a scanning tunneling microscope is a future possibility.

View Article: PubMed Central - PubMed

Affiliation: State key laboratory of precision spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China.

ABSTRACT
Quantum systems are inherently dissipation-less, making them excellent candidates even for classical information processing. We propose to use an array of large-spin quantum magnets for realizing a device which has two modes of operation: memory and data-bus. While the weakly interacting low-energy levels are used as memory to store classical information (bits), the high-energy levels strongly interact with neighboring magnets and mediate the spatial movement of information through quantum dynamics. Despite the fact that memory and data-bus require different features, which are usually prerogative of different physical systems--well isolation for the memory cells, and strong interactions for the transmission--our proposal avoids the notorious complexity of hybrid structures. The proposed mechanism can be realized with different setups. We specifically show that molecular magnets, as the most promising technology, can implement hundreds of operations within their coherence time, while adatoms on surfaces probed by a scanning tunneling microscope is a future possibility.

No MeSH data available.


Related in: MedlinePlus