Spectral thresholding quantum tomography for low rank states
Spectral thresholding quantum tomography for low rank states
复制标题
低阶态的光谱阈值量子断层扫描
DOI:
10.1088/1367-2630/17/11/113050
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发表时间:
2015
影响因子:
3.3
通讯作者:
Butucea C
中科院分区:
文献类型:
--
作者:
Butucea C
The estimation of high dimensional quantum states is an important statistical problem arising in current quantum technology applications. A key example is the tomography of multiple ions states, employed in the validation of state preparation in ion trap experiments (Häffner et al 2005 Nature 438 643). Since full tomography becomes unfeasible even for a small number of ions, there is a need to investigate lower dimensional statistical models which capture prior information about the state, and to devise estimation methods tailored to such models. In this paper we propose several new methods aimed at the efficient estimation of low rank states and analyse their performance for multiple ions tomography. All methods consist in first computing the least squares estimator, followed by its truncation to an appropriately chosen smaller rank. The latter is done by setting eigenvalues below a certain'noise level'to zero, while keeping the rest unchanged, or normalizing them appropriately. We show that (up to logarithmic factors in the space dimension) the mean square error of the resulting estimators scales as
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DOI:
10.1111/j.1467-9876.2012.01040.x
发表时间:
2012
期刊:
Journal of the Royal Statistical Society: Series C (Applied Statistics)
影响因子:
--
作者:
P. Jupp;P. Kim;J. Koo;Aron Pasieka
通讯作者:
Aron Pasieka
影响因子:
3.3
作者:
M. Guţă;T. Kypraios;I. Dryden
通讯作者:
I. Dryden
DOI:
10.1088/0305-4470/32/25/101
发表时间:
1999
期刊:
Journal of Physics A
影响因子:
--
作者:
J. Amiet;S. Weigert
通讯作者:
S. Weigert
影响因子:
8.6
作者:
Greg A. Smith;A. Silberfarb;I. Deutsch;P. Jessen
通讯作者:
P. Jessen
影响因子:
2.9
作者:
R. Chakrabarti;Anish Ghosh
通讯作者:
Anish Ghosh