Improved frequency standard via weighted graph states

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

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.

Keywords: spin squeezing weighted graph states interferometric sensitivity

Received: 14 February 2012
Revised: 19 April 2012
Accepted manuscript online:

PACS:	03.65.Yz	(Decoherence; open systems; quantum statistical methods)
	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)

Fund: 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).

Corresponding Authors: Xue Peng
E-mail: gnep.eux@gmail.com

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Xue Peng (薛鹏) Improved frequency standard via weighted graph states 2012 Chin. Phys. B 21 100306

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