Improved frequency standard via weighted graph states

We study the spin squeezing property of weighted graph states,which can be used to improve sensitivity in interferometry.We study the time evolution of spin squeezing under local decoherence acting independently on each qubit.Based on the analysis,the spin squeezing of the weighted graph states is s...

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Bibliographic Details
Published in:Chinese physics B 2012-10, Vol.21 (10), p.92-96, Article 100306
Main Author: 薛鹏
Format: Article
Language:English
Subjects:
Compressing
Evolution
Frequency standards
Graphs
Interferometry
Optimization
Qubits (quantum computing)
Tuning
加权图
压缩性
图形状态
时间演化
相干干涉
量子比特
频率标准
高灵敏度
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Summary:We study the spin squeezing property of weighted graph states,which can be used to improve sensitivity in interferometry.We study the time evolution of spin squeezing under local decoherence acting independently on each qubit.Based on the analysis,the spin squeezing of the weighted graph states is somehow robust in the presence of decoherence and the decoherence limit in the improvement of the interferometric sensitivity is still achievable.Furthermore,one can obtain the optimal improvement of sensitivity by tuning the weighted of each edges of the weighted graph state.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/21/10/100306