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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

Low and high energy subspaces.Array of S = 3/2 spins with large negative zero-field splitting D initialized in: (a) the low-energy subspace in the state of ; (b) high-energy subspaces in the state of . The transition between the low and high energy subspaces can be achieved with a global resonant pulse.
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f1: Low and high energy subspaces.Array of S = 3/2 spins with large negative zero-field splitting D initialized in: (a) the low-energy subspace in the state of ; (b) high-energy subspaces in the state of . The transition between the low and high energy subspaces can be achieved with a global resonant pulse.

Mentions: When S is half integer the eigenstates of (2) comes into pair of degenerate levels (called Kramers doublet20) with opposite magnetization m along the z direction (see Fig. 1). The states , which are the stable states when D > 0, are not suitable to implement a memory because a magnetic field, whatever small, can induce a transition between them. On the other hand, the states , which are the stable states when D < 0, represent a good candidate to implement a classical bit in a quantum memory because there is no direct physical coupling between them. In fact, since a jump between these two states can only occur via multiple-step processes, bit flip errors are exponentially suppressed.


Integrated information storage and transfer with a coherent magnetic device.

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

Low and high energy subspaces.Array of S = 3/2 spins with large negative zero-field splitting D initialized in: (a) the low-energy subspace in the state of ; (b) high-energy subspaces in the state of . The transition between the low and high energy subspaces can be achieved with a global resonant pulse.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f1: Low and high energy subspaces.Array of S = 3/2 spins with large negative zero-field splitting D initialized in: (a) the low-energy subspace in the state of ; (b) high-energy subspaces in the state of . The transition between the low and high energy subspaces can be achieved with a global resonant pulse.
Mentions: When S is half integer the eigenstates of (2) comes into pair of degenerate levels (called Kramers doublet20) with opposite magnetization m along the z direction (see Fig. 1). The states , which are the stable states when D > 0, are not suitable to implement a memory because a magnetic field, whatever small, can induce a transition between them. On the other hand, the states , which are the stable states when D < 0, represent a good candidate to implement a classical bit in a quantum memory because there is no direct physical coupling between them. In fact, since a jump between these two states can only occur via multiple-step processes, bit flip errors are exponentially suppressed.

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