PROCEEDINGS ARTICLE | June 2, 2017
Proc. SPIE. 10118, Advances in Photonics of Quantum Computing, Memory, and Communication X
KEYWORDS: Semiconductors, Chemical species, Single photon, Quantum dots, Quantum electrodynamics, Quantum networks, Quantum information, Quantum communications, Quantum information processing, Quantum memory
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 [1]. With such technique highly efficient single photon sources with brightness as large as 80% are demonstrated [2]. By minimizing the charge noise around the QD in a gated structure [3], 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 [4]. 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 [5].
References
[1] A. Dousse, et al. , Phys. Rev. Lett. 101, 267404 (2008)
[2] O. Gazzano, et al. , Nature Communications 4, 1425 (2013)
[3] A. Nowak. et al., Nature Communications 5, 3240 (2014)
[4] N. Somaschi, et al. Nature Photonics 10.1038/nphoton.2016.23 (2016).
[5] V. Giesz, et al., Nature Communications doi:10.1038/ncomms11986 (2016)
