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Oscillating photoni...
Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution
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- Pennacchietti, Matteo (author)
- Institute for Quantum Computing and Department of Electrical and Computer Engineering, University of Waterloo, N2L 3G1, Waterloo, ON, Canada
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- Cunard, Brady (author)
- Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, N2L 3G1, Waterloo, ON, Canada
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- Nahar, Shlok (author)
- Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, N2L 3G1, Waterloo, ON, Canada
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- Zeeshan, Mohd (author)
- National Research Council of Canada, K1A 0R6, Ottawa, ON, Canada
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- Gangopadhyay, Sayan (author)
- Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, N2L 3G1, Waterloo, ON, Canada
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- Poole, Philip J. (author)
- National Research Council of Canada, K1A 0R6, Ottawa, ON, Canada
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- Dalacu, Dan (author)
- National Research Council of Canada, K1A 0R6, Ottawa, ON, Canada; University of Ottawa, K1N 6N5, Ottawa, ON, Canada
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- Fognini, Andreas (author)
- Single Quantum B.V., 2628 CJ, Delft, The Netherlands
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- Jöns, Klaus D. (author)
- Institute for Photonic Quantum Systems (PhoQS), Center for Optoelectronics and Photonics Paderborn (CeOPP) and Department of Physics, Paderborn University, Warburger Straße 100, 33098, Paderborn, Germany, Warburger Straße 100
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- Zwiller, Val (author)
- KTH,Kvant- och biofotonik
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- Jennewein, Thomas (author)
- Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, N2L 3G1, Waterloo, ON, Canada
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- Lütkenhaus, Norbert (author)
- Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, N2L 3G1, Waterloo, ON, Canada
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- Reimer, Michael E. (author)
- Institute for Quantum Computing and Department of Electrical and Computer Engineering, University of Waterloo, N2L 3G1, Waterloo, ON, Canada; Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, N2L 3G1, Waterloo, ON, Canada
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(creator_code:org_t)
- Springer Nature, 2024
- 2024
- English.
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In: Communications Physics. - : Springer Nature. - 2399-3650. ; 7:1
- Related links:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- An on-demand source of bright entangled photon pairs is desirable for quantum key distribution (QKD) and quantum repeaters. The leading candidate to generate such pairs is based on spontaneous parametric down-conversion (SPDC) in non-linear crystals. However, its pair extraction efficiency is limited to 0.1% when operating at near-unity fidelity due to multiphoton emission at high brightness. Quantum dots in photonic nanostructures can in principle overcome this limit, but the devices with high entanglement fidelity (99%) have low pair extraction efficiency (0.01%). Here, we show a measured peak entanglement fidelity of 97.5% ± 0.8% and pair extraction efficiency of 0.65% from an InAsP quantum dot in an InP photonic nanowire waveguide. We show that the generated oscillating two-photon Bell state can establish a secure key for peer-to-peer QKD. Using our time-resolved QKD scheme alleviates the need to remove the quantum dot energy splitting of the intermediate exciton states in the biexciton-exciton cascade.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- ref (subject category)
- art (subject category)
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- By the author/editor
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Pennacchietti, M ...
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Cunard, Brady
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Nahar, Shlok
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Zeeshan, Mohd
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Gangopadhyay, Sa ...
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Poole, Philip J.
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show more...
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Dalacu, Dan
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Fognini, Andreas
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Jöns, Klaus D.
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Zwiller, Val
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Jennewein, Thoma ...
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Lütkenhaus, Norb ...
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Reimer, Michael ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
- Articles in the publication
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Communications P ...
- By the university
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Royal Institute of Technology