Improved frequency standard via weighted graph states

doi:10.1088/1674-1056/21/10/100306

中国物理B ›› 2012, Vol. 21 ›› Issue (10): 100306-100306.doi: 10.1088/1674-1056/21/10/100306

Improved frequency standard via weighted graph states

薛鹏

Department of Physics, Southeast University, Nanjing 211189, China

收稿日期:2012-02-14 修回日期:2012-04-19 出版日期:2012-09-01 发布日期:2012-09-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11004029 and 11174052), the Natural Science Foundation of Jiangsu Province of China (Grant No. BK2010422), the Ph. D. Program of the Ministry of Education of China, the Excellent Young Teachers Program of Southeast University and the National Basic Research Development Program of China (Grant No. 2011CB921203).

Improved frequency standard via weighted graph states

Xue Peng (薛鹏)

Department of Physics, Southeast University, Nanjing 211189, China

Received:2012-02-14 Revised:2012-04-19 Online:2012-09-01 Published:2012-09-01
Contact: Xue Peng E-mail:gnep.eux@gmail.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11004029 and 11174052), the Natural Science Foundation of Jiangsu Province of China (Grant No. BK2010422), the Ph. D. Program of the Ministry of Education of China, the Excellent Young Teachers Program of Southeast University and the National Basic Research Development Program of China (Grant No. 2011CB921203).

摘要/Abstract

摘要： 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.

关键词: spin squeezing, weighted graph states, interferometric sensitivity

Abstract: 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.

Key words: spin squeezing, weighted graph states, interferometric sensitivity

中图分类号: (Decoherence; open systems; quantum statistical methods)

03.65.Yz

03.67.Pp (Quantum error correction and other methods for protection against decoherence) 06.20.Dk (Measurement and error theory) 06.30.Ft (Time and frequency)

薛鹏. Improved frequency standard via weighted graph states[J]. 中国物理B, 2012, 21(10): 100306-100306.

Xue Peng (薛鹏). Improved frequency standard via weighted graph states[J]. Chin. Phys. B, 2012, 21(10): 100306-100306.

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Improved frequency standard via weighted graph states

Improved frequency standard via weighted graph states

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