Quantum-enhanced positioning and clock synchronization
Quantum-enhanced positioning and clock synchronization
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DOI：
10.1038/35086525
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发表时间：
2001-07-26
期刊：
影响因子：
64.8
通讯作者：
Maccone, L
中科院分区：
文献类型：
--
作者：
Giovannetti, V;Lloyd, S;Maccone, L
各种各样的定位和测距程序都是基于通过空间重复发送电磁脉冲并测量其到达时间。这种过程的准确性通常受到可用功率和带宽的限制。量子纠缠和压缩已经在干涉测量（1-5）、频率测量（6）、光刻（7）和算法（8）的背景下被利用。在这里，我们报告，量子纠缠和压缩也可以用来克服经典限制的程序，如定位系统，时钟同步和测距。我们使用频率纠缠脉冲来构建这些协议的量子版本，结果与经典类似物相比，精度更高。我们详细描述的问题，建立一个相对于一个固定的参考点阵列的位置。
A ide variety of positioning and ranging procedures are based on repeatedly sending electromagnetic pulses through space and measuring their time of arrival. The accuracy of such procedures is classically limited by the available power and bandwidth. Quantum entanglement and squeezing have been exploited in the context of interferometry(1-5), frequency measurements(6), lithography(7) and algorithms(8). Here we report that quantum entanglement and squeezing can also be employed to overcome the classical limits in procedures such as positioning systems, clock synchronization and ranging. Our use of frequency-entangled pulses to construct quantum versions of these protocols results in enhanced accuracy compared with their classical analogues. We describe in detail the problem of establishing a position with respect to a fixed array of reference points.