Tiersch M, Guerreschi G G, Clausen J, Briegel H J
Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences , Technikerstrasse 21A, A-6020 Innsbruck, Austria.
J Phys Chem A. 2014 Jan 9;118(1):13-20. doi: 10.1021/jp408569d. Epub 2013 Dec 27.
Chemical magnetometers are radical pair systems such as solutions of pyrene and N,N-dimethylaniline (Py-DMA) that show magnetic field effects in their spin dynamics and their fluorescence. We investigate the existence and decay of quantum entanglement in free geminate Py-DMA radical pairs and discuss how entanglement can be assessed in these systems. We provide an entanglement witness and propose possible observables for experimentally estimating entanglement in radical pair systems with isotropic hyperfine couplings. As an application, we analyze how the field dependence of the entanglement lifetime in Py-DMA could in principle be used for magnetometry and illustrate the propagation of measurement errors in this approach.
化学磁力计是自由基对系统，如芘和N，N - 二甲基苯胺（Py - DMA）的溶液，它们在自旋动力学和荧光中表现出磁场效应。我们研究了自由双生Py - DMA自由基对中量子纠缠的存在和衰减，并讨论了如何在这些系统中评估纠缠。我们提供了一个纠缠见证，并提出了可能的可观测量，用于实验估计具有各向同性超精细耦合的自由基对系统中的纠缠。作为一个应用，我们分析了Py - DMA中纠缠寿命的场依赖性原则上如何用于磁力测量，并说明了这种方法中测量误差的传播。
