Research on controlling the perfect transfer of the two-qubit quantum information in spin chain

Some thermodynamical properties of solids, such as heat capacity and magnetic susceptibility, have recently been shown to be linked to the amount of entanglement in a solid. Until now, however, it was not clear whether this entanglement can be used as a resource in quantum information theory. Here we show that this entanglement is physical, demonstrating the principles of its extraction from a typical spin chain by scattering two particles off the system. Moreover, we show how to simulate this process using present-day optical lattice technology.

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Perfect Transfer of Entangled States on Spin Chain

International Journal of Theoretical Physics ◽

10.1007/s10773-006-9202-4 ◽

2007 ◽

Vol 46 (3) ◽

pp. 614-624 ◽

Cited By ~ 1

Author(s):

Jing-Ling Chen ◽

Qing-Liang Wang

Keyword(s):

Spin Chain ◽

Entangled States ◽

Perfect Transfer

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QUANTUM INFORMATION TRANSFER IN A TWO-PARALLEL SPIN-CHAIN CHANNEL WITH INTERNAL AND EXTERNAL EFFECTS

International Journal of Modern Physics B ◽

10.1142/s0217979210055019 ◽

2010 ◽

Vol 24 (10) ◽

pp. 1279-1288 ◽

Cited By ~ 1

Author(s):

JIA LIU ◽

GUO-FENG ZHANG ◽

ZI-YU CHEN

Keyword(s):

Magnetic Field ◽

Spin Chain ◽

Information Transfer ◽

Initial Condition ◽

Spin Orbit Coupling ◽

Entanglement Sudden Death ◽

External Effects ◽

Perfect Transfer ◽

Entanglement Transfer ◽

Moriya Interaction

With the effects of Dzialoshinski–Moriya interaction and external magnetic field, the entanglement transfer has been investigated in a parallel spin-chain system. Our results imply that the perfect transfer can be realized at some special times, and the transfer time can be greatly condensed with the rising of the spin-orbit coupling strength. The entanglement sudden death phenomenon is sensitive to the initial condition. In addition, due to the application of magnetic field on the channel spins, the reliability and efficiency of the transmission are greatly challenged.

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Quantum Information Storage in the Localized State of a Spin Chain

Open Systems & Information Dynamics ◽

10.1007/s11080-007-9027-5 ◽

2007 ◽

Vol 14 (01) ◽

pp. 41-51 ◽

Cited By ~ 7

Author(s):

Tony J. G. Apollaro ◽

Francesco Plastina

Keyword(s):

Quantum Information ◽

Exchange Interaction ◽

Spin Chain ◽

Anderson Localization ◽

Information Storage ◽

Spatial Inhomogeneity ◽

Level Spacing ◽

Localized State ◽

Small Defect ◽

A Chain

We describe a chain of qubits with always on exchange interaction in the presence of a spatial inhomogeneity in the qubit level spacing. Similarly to the phenomenon of Anderson localization, this system has a localized eigenstate which can be used to store or trap quantum information. We discuss both the fidelity of storage and the leakage of information from this localized state and show that even a very small defect can be useful.

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Efficient routing quantum information in one-dimensional tight-binding array

Progress of Theoretical and Experimental Physics ◽

10.1093/ptep/ptaa051 ◽

2020 ◽

Vol 2020 (5) ◽

Author(s):

Bing Chen ◽

Yu-Zhen He ◽

Tian-Tian Chu ◽

Qing-Hui Shen ◽

Jia-Ming Zhang ◽

...

Keyword(s):

Quantum Information ◽

Tight Binding ◽

W State ◽

One Dimensional ◽

Site Energy ◽

Multiple Receivers ◽

Perfect Transfer ◽

Quantum Router ◽

Similar Idea ◽

Data Bus

Abstract We present an efficient quantum router using a fully-engineered one-dimensional tight-binding array acting as quantum data bus. Quantum routing is achieved by weakly coupling the sender and the receivers to the data bus. We show that perfect transfer of a state between sender and a chosen receiver can be achieved via appropriately tuning the on-site energy applied on the site of the sender. A generalization of this model to the case of multiple receivers is then studied. The results show that the state is equally split between receivers who participate in communication. Moreover, that a similar idea can be used to create $W$ state between all receivers is further emphasized.

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Speeding up the spread of quantum information in chaotic systems

Journal of High Energy Physics ◽

10.1007/jhep12(2021)019 ◽

2021 ◽

Vol 2021 (12) ◽

Author(s):

Stefan Eccles ◽

Willy Fischler ◽

Tyler Guglielmo ◽

Juan F. Pedraza ◽

Sarah Racz

Keyword(s):

Quantum Information ◽

Spin Chain ◽

Chaotic Systems ◽

Gauge Theories ◽

Lattice Models ◽

Quantum Systems ◽

Entanglement Generation ◽

Information Spreading ◽

Spin Chain Models

Abstract We explore the effect of introducing mild nonlocality into otherwise local, chaotic quantum systems, on the rate of information spreading and associated rates of entanglement generation and operator growth. We consider various forms of nonlocality, both in 1-dimensional spin chain models and in holographic gauge theories, comparing the phenomenology of each. Generically, increasing the level of nonlocality increases the rate of information spreading, but in lattice models we find instances where these rates are slightly suppressed.

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