Quantum enhanced optical phase estimation with a squeezed thermal state
- URL: http://arxiv.org/abs/2004.05831v1
- Date: Mon, 13 Apr 2020 09:02:48 GMT
- Title: Quantum enhanced optical phase estimation with a squeezed thermal state
- Authors: Juan Yu, Yue Qin, Jinliang Qin, Hong Wang, Zhihui Yan, Xiaojun Jia,
and Kunchi Peng
- Abstract summary: Quantum phase estimation protocols can provide a measuring method of phase shift with precision superior to standard quantum limit.
A squeezed vacuum state has been pointed out a sensitive resource for quantum phase estimation.
- Score: 10.080495095463252
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum phase estimation protocols can provide a measuring method of phase
shift with precision superior to standard quantum limit (SQL) due to the
application of a nonclassical state of light. A squeezed vacuum state, whose
variance in one quadrature is lower than the corresponding SQL, has been
pointed out a sensitive resource for quantum phase estimation and the
estimation accuracy is directly influenced by the properties of the squeezed
state. Here we detailedly analyze the influence of the purity and squeezing
level of the squeezed state on the accuracy of quantum phase estimation. The
maximum precision that can be achieved for a squeezed thermal state is
evaluated, and the experimental results are in agreement with the theoretical
analyses. It is also found that the width of the phase estimation interval
$\Delta \theta $ beyond SQL is correlated with the purity of the squeezed
state.
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