Robustness Analysis of Quantum State Transfer through Spin-Chain in Diamond for Room-Temperature Quantum Computing

2018 ◽  
Author(s):  
Zhiping Yu ◽  
Jiaqi Jiang ◽  
Yan Wang
Keyword(s):  
Quantum Computing ◽  
Quantum State ◽  
Spin Chain ◽  
Room Temperature ◽  
Robustness Analysis ◽  
Quantum State Transfer ◽  
State Transfer

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

scholarly journals Adiabatic quantum state transfer in a semiconductor quantum-dot spin chain

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yadav P. Kandel ◽  
Haifeng Qiao ◽  
Saeed Fallahi ◽  
Geoffrey C. Gardner ◽  
Michael J. Manfra ◽  
...  
Keyword(s):  
Quantum Computing ◽  
Quantum Dot ◽  
Quantum State ◽  
Information Transfer ◽  
Full Potential ◽  
Quantum State Transfer ◽  
Spin Qubits ◽  
Semiconductor Quantum Dot ◽  
State Transfer ◽  
Spin Singlet

AbstractSemiconductor quantum-dot spin qubits are a promising platform for quantum computation, because they are scalable and possess long coherence times. In order to realize this full potential, however, high-fidelity information transfer mechanisms are required for quantum error correction and efficient algorithms. Here, we present evidence of adiabatic quantum-state transfer in a chain of semiconductor quantum-dot electron spins. By adiabatically modifying exchange couplings, we transfer single- and two-spin states between distant electrons in less than 127 ns. We also show that this method can be cascaded for spin-state transfer in long spin chains. Based on simulations, we estimate that the probability to correctly transfer single-spin eigenstates and two-spin singlet states can exceed 0.95 for the experimental parameters studied here. In the future, state and process tomography will be required to verify the transfer of arbitrary single qubit states with a fidelity exceeding the classical bound. Adiabatic quantum-state transfer is robust to noise and pulse-timing errors. This method will be useful for initialization, state distribution, and readout in large spin-qubit arrays for gate-based quantum computing. It also opens up the possibility of universal adiabatic quantum computing in semiconductor quantum-dot spin qubits.

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