Limits...
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

Emergence of energy bands.Energy spectrum of Htot for N = 5, , and E = 0, as a function of D/J. When /D/ ≫ J a band structure appears in the spectrum. The lowest energy band (composed by the 2N levels in the subspace ) forms the memory subspace, while the highest energy band (composed by the 2N levels in the subspace ) forms the data-bus subspace.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4561894&req=5

f2: Emergence of energy bands.Energy spectrum of Htot for N = 5, , and E = 0, as a function of D/J. When /D/ ≫ J a band structure appears in the spectrum. The lowest energy band (composed by the 2N levels in the subspace ) forms the memory subspace, while the highest energy band (composed by the 2N levels in the subspace ) forms the data-bus subspace.

Mentions: For negative D, in the regime /D/ ≫ J, these two effective subspaces become energetically well separated. To see this, in Fig. 2 we plot the spectrum of Htot as a function of D. As it is evident from the figure, a band structure appears when /D/ ≫ J in which the lowest band is formed by states in the memory subspace , while the highest band is formed by states in the data-bus subspace . If we initialize our systems in one the bands, throughout the dynamics other bands are hardly populated. This suggests that there should be an effective description for the dynamics within the memory and data-bus subspaces. In the next section we provide effective Hamiltonians for each of these subspaces.


Integrated information storage and transfer with a coherent magnetic device.

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

Emergence of energy bands.Energy spectrum of Htot for N = 5, , and E = 0, as a function of D/J. When /D/ ≫ J a band structure appears in the spectrum. The lowest energy band (composed by the 2N levels in the subspace ) forms the memory subspace, while the highest energy band (composed by the 2N levels in the subspace ) forms the data-bus subspace.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f2: Emergence of energy bands.Energy spectrum of Htot for N = 5, , and E = 0, as a function of D/J. When /D/ ≫ J a band structure appears in the spectrum. The lowest energy band (composed by the 2N levels in the subspace ) forms the memory subspace, while the highest energy band (composed by the 2N levels in the subspace ) forms the data-bus subspace.
Mentions: For negative D, in the regime /D/ ≫ J, these two effective subspaces become energetically well separated. To see this, in Fig. 2 we plot the spectrum of Htot as a function of D. As it is evident from the figure, a band structure appears when /D/ ≫ J in which the lowest band is formed by states in the memory subspace , while the highest band is formed by states in the data-bus subspace . If we initialize our systems in one the bands, throughout the dynamics other bands are hardly populated. This suggests that there should be an effective description for the dynamics within the memory and data-bus subspaces. In the next section we provide effective Hamiltonians for each of these subspaces.

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