Journal
SCIENCE
Volume 332, Issue 6034, Pages 1170-1173Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1202218
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Funding
- Natural Sciences and Engineering Research Council of Canada
- Canadian Institute for Advanced Research, and QuantumWorks
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A consequence of the quantum mechanical uncertainty principle is that one may not discuss the path or trajectory that a quantum particle takes, because any measurement of position irrevocably disturbs the momentum, and vice versa. Using weak measurements, however, it is possible to operationally define a set of trajectories for an ensemble of quantum particles. We sent single photons emitted by a quantum dot through a double-slit interferometer and reconstructed these trajectories by performing a weak measurement of the photon momentum, postselected according to the result of a strong measurement of photon position in a series of planes. The results provide an observationally grounded description of the propagation of subensembles of quantum particles in a two-slit interferometer.
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