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arXiv 1406.7626quant-ph
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基于Dicke压缩态的量子精密测量

Quantum Metrology with Dicke Squeezed States

Zhen Zhang, Luming Duan

摘要:

介绍了一类新的量子多粒子纠缠态--Dicke压缩态(DS态),它可以用来提高量子精密测量的精度,使之超过标准量子极限。我们发现,测量精度的提高,其特征在于由一个单一的实验检测参数,称为迪克压缩$ξ_{D}$,这也限制了这类状态的纠缠深度。当$ξ_{D}$达到理想Dicke态的最小值时,测量精度接近海森堡极限.与其他纠缠态相比,我们证明了Dicke压缩态对退相干的鲁棒性更强,并且在典型的实验噪声下具有更好的测量精度。

英文摘要:

We introduce a new class of quantum many-particle entangled states, called the Dicke squeezed (or DS) states, which can be used to improve the precision in quantum metrology beyond the standard quantum limit. We show that the enhancement in measurement precision is characterized by a single experimentally detectable parameter, called the Dicke squeezing $ξ_{D}$, which also bounds the entanglement depth for this class of states. The measurement precision approaches the ultimate Heisenberg limit as $ξ_{D}$ attains the minimum in an ideal Dicke state. Compared with other entangled states, we show that the Dicke squeezed states are more robust to decoherence and give better measurement precision under typical experimental noise.

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