Entanglement between a photon and a quantum well.
The lack of translational invariance perpendicular to the plane of a single quantum well causes equal probability for spontaneous emission to the left or right. Combining one emission path from the left and one from the right into a common detector leads to interference fringes for fundamentally indistinguishable paths corresponding to geometries where the same in-plane momentum is transferred to the quantum well. For all other paths, no interference is observed because of the entanglement between the photon and extended Bloch states of the many-body system. In multiple-quantum-well structures the interference can be controlled via the spacing between the wells.
Hoyer
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Department of Physics, Philipps-University, Renthof 5, D-35032 Marburg, Germany. hoyer@acms.arizona.edu
Kira
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Koch
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Stolz
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Mosor
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Sweet
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Ell
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Khitrova
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Gibbs
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