Phys. Rev. Lett. 103, 217402 (2009) [4 pages]Creating Polarization-Entangled Photon Pairs from a Semiconductor Quantum Dot Using the Optical Stark EffectReceived 3 June 2009; published 20 November 2009 In typical epitaxial quantum dots (QDs) the ideally degenerate optical excitons are energy split, preventing the formation of two-photon entanglement in a biexciton decay. We use an external field, here a continuous-wave laser tuned to the QD in the ac Stark limit, to cancel the splitting and create two-photon entanglement. Quantum-state tomography is used to construct the two-photon density matrix. When the splitting is removed it satisfies well-known entanglement tests. Our approach shows that polarization-entangled photons can be routinely produced in semiconductor nanostructures. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.217402
DOI:
10.1103/PhysRevLett.103.217402
PACS:
78.67.Hc, 42.50.Pq, 78.47.−p, 78.55.−m
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