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arXiv 0811.4350quant-ph
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使用10自旋NOON态的超出标准量子极限的磁场感测

Magnetic field sensing beyond the standard quantum limit using 10-spin NOON states

Jonathan A. Jones, Steven D. Karlen, Joe Fitzsimons, Arzhang Ardavan, Simon C. Benjamin, G. A. D. Briggs, John J. L. Morton

摘要:

纠缠的概念,其中相干量子态变得不可避免地相关,已经从量子力学最令人吃惊和最有争议的结果之一演变为新兴技术的使能原理,如量子计算和量子传感器。在测量中使用纠缠粒子可以超越灵敏度的标准量子极限(N个粒子的灵敏度为N^1/2)到海森堡极限(N)。这种方法已应用于使用纠缠光子和自旋对的光学干涉测量,用于测量磁场和改进原子钟。在这里,我们实验证明了9.4倍的灵敏度增加到外部磁场的10自旋纠缠态,与孤立的自旋相比,使用核自旋在一个高度对称的分子。与量子比特丢失普遍存在的系统相比,这种方法以有利的方式扩展,并为磁场感测中的增强精度铺平了道路

英文摘要:

The concept of entanglement, in which coherent quantum states become inextricably correlated, has evolved from one of the most startling and controversial outcomes of quantum mechanics to the enabling principle of emerging technologies such as quantum computation and quantum sensors. The use of entangled particles in measurement permits the transcendence of the standard quantum limit in sensitivity, which scales as N^1/2 for N particles, to the Heisenberg limit, which scales as N. This approach has been applied to optical interferometry using entangled photons and spin pairs for the measurement of magnetic fields and improvements on atomic clocks. Here, we demonstrate experimentally an 9.4-fold increase in sensitivity to an external magnetic field of a 10-spin entangled state, compared with an isolated spin, using nuclear spins in a highly symmetric molecule. This approach scales in a favourable way compared to systems where qubit loss is prevalent, and paves the way for enhanced precision in magnetic field sensing

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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