Centre for Quantum Information and Quantum Control, Department of Physics, University of Toronto, 60 Saint George Street, Toronto, Ontario M5S 1A7, Canada.; Canadian Institute for Advanced Research, 180 Dundas Street West, Suite 1400, Toronto, Ontario M5G 1Z8, Canada.
Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.
Sci Adv. 2016 Feb 19;2(2):e1501466. doi: 10.1126/science.1501466. eCollection 2016 Feb.
Weak measurement allows one to empirically determine a set of average trajectories for an ensemble of quantum particles. However, when two particles are entangled, the trajectories of the first particle can depend nonlocally on the position of the second particle. Moreover, the theory describing these trajectories, called Bohmian mechanics, predicts trajectories that were at first deemed "surreal" when the second particle is used to probe the position of the first particle. We entangle two photons and determine a set of Bohmian trajectories for one of them using weak measurements and postselection. We show that the trajectories seem surreal only if one ignores their manifest nonlocality.
弱测量允许人们从经验上确定一组量子粒子的平均轨迹。然而，当两个粒子纠缠时，第一个粒子的轨迹可以非局域地依赖于第二个粒子的位置。此外，描述这些轨迹的理论，称为玻姆力学，预测了当第二个粒子被用来探测第一个粒子的位置时，轨迹会显得“超现实”。我们使两个光子纠缠，并使用弱测量和后选择来确定其中一个光子的一组玻姆轨迹。我们表明，只有当人们忽略它们明显的非局域性时，这些轨迹才显得超现实。
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