Stimulated emission of polarization-entangled photons

A. Lamas-Linares, J. C. Howell and D. Bouwmeester ()
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A. Lamas-Linares: Centre for Quantum Computation, Clarendon Laboratory, University of Oxford
J. C. Howell: Centre for Quantum Computation, Clarendon Laboratory, University of Oxford
D. Bouwmeester: Centre for Quantum Computation, Clarendon Laboratory, University of Oxford

Nature, 2001, vol. 412, issue 6850, 887-890

Abstract: Abstract Entangled photon pairs—discrete light quanta that exhibit non-classical correlations—play a crucial role in quantum information science (for example, in demonstrations of quantum non-locality1,2,3,4,5,6,7, quantum teleportation8,9 and quantum cryptography10,11,12,31). At the macroscopic optical-field level non-classical correlations can also be important, as in the case of squeezed light13, entangled light beams14,15 and teleportation of continuous quantum variables16. Here we use stimulated parametric down-conversion to study entangled states of light that bridge the gap between discrete and macroscopic optical quantum correlations. We demonstrate experimentally the onset of laser-like action for entangled photons, through the creation and amplification of the spin-1/2 and spin-1 singlet states consisting of two and four photons, respectively. This entanglement structure holds great promise in quantum information science where there is a strong demand for entangled states of increasing complexity.

Date: 2001
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DOI: 10.1038/35091014

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