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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 third order effective hopping term in the memory-subspace.The third-order effective hopping Hamiltonian in the low-energy subspace can be explained by the application of  (with S± = Sx ± iSy), which arises in the third order perturbation theory used for getting the effective Hamiltonian (see Supplementary Material for more details). In fact, the three consecutive operations of the term  result in spin swap in the low-energy subspace through virtually populating the high-energy states. We show the states , for n = 0 (a), n = 1 (b), n = 2 (c), n = 3 (d), which are populated during the process.
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f3: The third order effective hopping term in the memory-subspace.The third-order effective hopping Hamiltonian in the low-energy subspace can be explained by the application of (with S± = Sx ± iSy), which arises in the third order perturbation theory used for getting the effective Hamiltonian (see Supplementary Material for more details). In fact, the three consecutive operations of the term result in spin swap in the low-energy subspace through virtually populating the high-energy states. We show the states , for n = 0 (a), n = 1 (b), n = 2 (c), n = 3 (d), which are populated during the process.

Mentions: and ξ = 90 in the bulk and ξ = 63 at the boundaries. In (4) the matrices τx,y,z are Pauli operators defined in the effective subspace . To the lowest order the effective interaction in the low-energy subspace is of Ising-type, as shown also in31, and thus does not induce direct transitions between energy levels. Magnetic exchange between two neighboring sites is governed by a third order effect, as reflected in the effective coupling Jmem displayed in Eq. (5). This third order process is mediated by the virtual processes depicted in Fig. 3 where two high-energy levels are 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 third order effective hopping term in the memory-subspace.The third-order effective hopping Hamiltonian in the low-energy subspace can be explained by the application of  (with S± = Sx ± iSy), which arises in the third order perturbation theory used for getting the effective Hamiltonian (see Supplementary Material for more details). In fact, the three consecutive operations of the term  result in spin swap in the low-energy subspace through virtually populating the high-energy states. We show the states , for n = 0 (a), n = 1 (b), n = 2 (c), n = 3 (d), which are populated during the process.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: The third order effective hopping term in the memory-subspace.The third-order effective hopping Hamiltonian in the low-energy subspace can be explained by the application of (with S± = Sx ± iSy), which arises in the third order perturbation theory used for getting the effective Hamiltonian (see Supplementary Material for more details). In fact, the three consecutive operations of the term result in spin swap in the low-energy subspace through virtually populating the high-energy states. We show the states , for n = 0 (a), n = 1 (b), n = 2 (c), n = 3 (d), which are populated during the process.
Mentions: and ξ = 90 in the bulk and ξ = 63 at the boundaries. In (4) the matrices τx,y,z are Pauli operators defined in the effective subspace . To the lowest order the effective interaction in the low-energy subspace is of Ising-type, as shown also in31, and thus does not induce direct transitions between energy levels. Magnetic exchange between two neighboring sites is governed by a third order effect, as reflected in the effective coupling Jmem displayed in Eq. (5). This third order process is mediated by the virtual processes depicted in Fig. 3 where two high-energy levels are 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