Semiconductor quantum dots (QDs) are promising artificial atoms for quantum information processing: they can generate single photons flying quantum bits; they show single photon sensitivity promising to develop quantum gates and the spin of a carrier in a QD can be a quantum memory. The scalability of a quantum network requires efficient interfaces between stationary and flying quantum bits. In the last few years, our group has made important progresses in this direction using cavity quantum electrodynamics.
With a deterministic positioning of a single QD in a microcavity, we control the QD spontaneous emission on demand . With such technique highly efficient single photon sources with brightness as large as 80% are demonstrated . By minimizing the charge noise around the QD in a gated structure , we demonstrate the generation of fully indistinguishable photon. The source brightness is shown to exceed by one or two orders of magnitude the one of a parametric down-conversion source of same quality . Symmetrically, these devices perform as excellent interfaces between a flying quantum bit and a stationary one, where coherent control of a quantum bit can be done when only few photons .
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Lorenzo De Santis, Carlos A. Solanas, Niccolo Somaschi, Aristide Lemaitre, Isabelle Sagnes, Valerian Giesz, Loic Lanco, and Pascale Senellart, "Quantum-dot-based quantum devices (Conference Presentation)," Proc. SPIE 10118, Advances in Photonics of Quantum Computing, Memory, and Communication X, 101180U (Presented at SPIE OPTO: February 02, 2017; Published: 2 June 2017); https://doi.org/10.1117/12.2252749.5397361509001.
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