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CNST Researchers Demonstrate Electo-Optic Modulation of Single Photons from a Quantum DotGaithersburg, MD | Posted on June 29th, 2011
However, the temporal profile of these single photon pulses, described as a photon wave packet, is typically not ideal for use in quantum information processing. Using commercial, high-performance telecommunications electro-optic modulators, the researchers were able to temporally manipulate these wave packets to produce a variety of shapes, including optimally-shaped Gaussian pulses. Compared to previous work, this approach reduced the modulation timescale more than two orders of magnitude, reaching the sub-nanosecond regime needed for semiconductor QDs. Finally, the researchers proposed that such electro-optic modulation may be a method for improving the quality of single photons from existing QD sources. Because of decoherence, single photons generated by a QD are not identical, and instead have different wave packets. Electro-optic modulation could be a flexible and spectrally broadband way to select for the decoherence-free portion of the QD emission, and thereby improve the photon indistinguishability needed for quantum information processing applications.
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