scholarly journals High-dimensional quantum state transfer through a quantum spin chain

2013 ◽  
Vol 87 (1) ◽  
Author(s):  
Wei Qin ◽  
Chuan Wang ◽  
Gui Lu Long
Keyword(s):  
Quantum State ◽  
Spin Chain ◽  
Quantum Spin ◽  
High Dimensional ◽  
Quantum State Transfer ◽  
Quantum Spin Chain ◽  
State Transfer

scholarly journals Transfer of high-dimensional quantum state through an XXZ-Heisenberg quantum spin chain

2015 ◽  
Vol 29 (29) ◽  
pp. 1550207 ◽  
Author(s):  
Zhe Yang ◽  
Ming Gao ◽  
Wei Qin
Keyword(s):  
Quantum State ◽  
Spin Chain ◽  
Inhomogeneous Magnetic Field ◽  
Quantum Spin ◽  
High Dimensional ◽  
Quantum State Transfer ◽  
Unitary Evolution ◽  
Thermal Equilibrium State ◽  
Heisenberg Spin Chain ◽  
Data Bus

In this paper, we propose and analyze an efficient high-dimensional quantum state transfer (QST) scheme through an XXZ-Heisenberg spin chain in an inhomogeneous magnetic field. By the use of a combination of coherent quantum coupling and free spin wave approximation, pure unitary evolution results in a perfect high-dimensional swap operation between two remote quantum registers mediated by a uniform quantum data bus and the feasibility is confirmed by numerical simulations. Also, we observe that either the strong z-directional coupling or high quantum spin number can partly suppress the thermal excitations and protect quantum information from the thermal noises when the quantum data bus is in the thermal equilibrium state.

scholarly journals How to counteract systematic errors in quantum state transfer

2012 ◽  
Vol 12 (7&8) ◽  
pp. 648-660
Author(s):  
Chiara Marletto ◽  
Alastair Kay ◽  
Artur Ekert
Keyword(s):  
Quantum State ◽  
Spin Chain ◽  
Systematic Errors ◽  
Quantum State Transfer ◽  
State Transfer

In the absence of errors, the dynamics of a spin chain, with a suitably engineered local Hamiltonian, allow the perfect, coherent transfer of a quantum state over large distances. Here, we propose encoding and decoding procedures to recover perfectly from low rates of systematic errors. The encoding and decoding regions, located at opposite ends of the chain, are small compared to the length of the chain, growing linearly with the size of the error. We also describe how these errors can be identified, again by only acting on the encoding and decoding regions.

Quantum state transfer through a thermal spin channel

2014 ◽  
Vol 28 (15) ◽  
pp. 1450090
Author(s):  
Xiao Qiang Su ◽  
An Min Wang ◽  
Guo Hui Yang
Keyword(s):  
Quantum State ◽  
Ground State ◽  
Spin Chain ◽  
Transfer Time ◽  
Quantum State Transfer ◽  
Spin Channel ◽  
State Transfer

The dynamics of quantum state transfer through a thermal spin chain with Heisenberg interaction is discussed by numerically calculating the maximal fidelity in a finite transfer time for the chains with several numbers of sites. We find that the maximal fidelity does not decrease monotonously with the increase in the temperature, but depends on the maximal allowed transfer time. Finally, we compare the results of thermal channel with the transfer through ground state channel.

scholarly journals Quantum state transfer through a spin chain in a multiexcitation subspace

2012 ◽  
Vol 86 (2) ◽  
Author(s):  
Zhao-Ming Wang ◽  
Rui-Song Ma ◽  
C. Allen Bishop ◽  
Yong-Jian Gu
Keyword(s):  
Quantum State ◽  
Spin Chain ◽  
Quantum State Transfer ◽  
State Transfer
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