Avron J E, Bisker G, Gershoni D, Lindner N H, Meirom E A, Warburton R J
Department of Physics, Technion-Israel Institute of Technology, 32000 Haifa, Israel.
Phys Rev Lett. 2008 Mar 28;100(12):120501. doi: 10.1103/PhysRevLett.100.120501.
Entangled photons can be generated "on demand" in a novel scheme involving unitary time reordering of the photons emitted in a radiative decay cascade. The scheme yields polarization entangled photon pairs, even though prior to reordering the emitted photons carry significant "which path information" and their polarizations are unentangled. This shows that quantum chronology can be manipulated in a way that is lossless and deterministic (unitary). The theory can, in principle, be tested and applied to the biexciton cascade in semiconductor quantum dots.
在一种涉及对辐射衰变级联中发射的光子进行幺正时间重排的新方案中，可以“按需”产生纠缠光子。该方案产生偏振纠缠光子对，尽管在重排之前发射的光子携带大量“路径信息”且其偏振是不纠缠的。这表明量子时间顺序可以以无损且确定性（幺正）的方式进行操控。原则上，该理论可以进行检验并应用于半导体量子点中的双激子级联。
