Quantum Optics Seminar by Pascale Senellart – Niels Bohr Institute - University of Copenhagen

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Quantum Optics Seminar by Pascale Senellart

By deterministically coupling a single quantum dot to the optical mode of a micropillar cavity, we implement a highly efficient single quantum dot-single photon interface. We demonstrate the fabrication of ultrabright sources of indistinguishable single photons with a record brightness of 79% collected photon per pulse. The indistinguishability of the emitted photons is investigated as a function of brightness and excitation conditions. The potential of the sources is demonstrated by implementing a quantum logic gate allowing the entanglement of two independently generated photons. Symmetrically, we show that such devices can be used to demosntrate optical non-linearities at the level of only 8 incident photons. Finally, we propose  new cavity geometry and advanced technology allowing to combine deterministic control of the spontaneous emission with electrical control of the devices. This step is crucial for the scalability of a solid state quantum network based on semiconductor quantum dots.