Journal
NATURE NANOTECHNOLOGY
Volume 12, Issue 7, Pages 663-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2017.85
Keywords
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Funding
- ERC Starting Grant [277885 QD-CQED]
- French Agence Nationale pour la Recherche (grant ANR SPIQE)
- French Agence Nationale pour la Recherche (grant USSEPP)
- French RENATECH network
- French National Research Agency (ANR) as part of the 'Investissements d'Avenir' programme (Labex NanoSaclay) [ANR-10-LABX-0035]
- ARC Centres for Engineered Quantum Systems [CE110001013]
- Quantum Computation and Communication Technology [CE110001027]
- Asian Office of Aerospace Research and Development [FA2386-13-1-4070]
- Marie Sklodowska-Curie Individual Fellowship SQUAPH
- University of Queensland Vice-Chancellor's Research and Teaching Fellowship
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A strong limitation of linear optical quantum computing is the probabilistic operation of two-quantum-bit gates based on the coalescence of indistinguishable photons. A route to deterministic operation is to exploit the single-photon nonlinearity of an atomic transition. Through engineering of the atom-photon interaction, phase shifters, photon filters and photon-photon gates have been demonstrated with natural atoms. Proofs of concept have been reported with semiconductor quantum dots, yet limited by inefficient atom-photon interfaces and dephasing. Here, we report a highly efficient single-photon filter based on a large optical nonlinearity at the single-photon level, in a near-optimal quantum-dot cavity interface. When probed with coherent light wavepackets, the device shows a record nonlinearity threshold around 0.3 +/- 0.1 incident photons. We demonstrate that 80% of the directly reflected light intensity consists of a single-photon Fock state and that the two-and three-photon components are strongly suppressed compared with the single-photon one.
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