Resch K J, Steinberg A M
Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, A-1090 Vienna, Austria.
Phys Rev Lett. 2004 Apr 2;92(13):130402. doi: 10.1103/PhysRevLett.92.130402. Epub 2004 Mar 30.
Weak measurement is a new technique which allows one to describe the evolution of postselected quantum systems. It appears to be useful for resolving a variety of thorny quantum paradoxes, particularly when used to study properties of pairs of particles. Unfortunately, such nonlocal or joint observables often prove difficult to measure directly in practice (for instance, in optics-a common testing ground for this technique-strong photon-photon interactions would be needed to implement an appropriate von Neumann interaction). Here we derive a general, experimentally feasible, method for extracting these joint weak values from correlations between single-particle observables.
弱测量是一种新技术，它能让人们描述后选择量子系统的演化。它似乎有助于解决各种棘手的量子悖论，特别是在用于研究粒子对的性质时。不幸的是，这种非局域或联合可观测量在实践中往往很难直接测量（例如，在光学领域——该技术的一个常见试验场——需要强光子-光子相互作用来实现适当的冯·诺依曼相互作用）。在此，我们推导出一种通用的、实验上可行的方法，用于从单粒子可观测量之间的相关性中提取这些联合弱值。
