Quantum repeater is the key element in quantum communication and quantum information processing. Here, we investigate the possibility of achieving a heralded quantum repeater based on the scattering of photons off single emitters in one-dimensional waveguides. We design the compact quantum circuits for nonlocal entanglement generation, entanglement swapping, and entanglement purification, and discuss the feasibility of our protocols with current experimental technology. In our scheme, we use a parametric down-conversion source instead of ideal single-photon sources to realize the heralded quantum repeater. Moreover, our protocols can turn faulty events into the detection of photon polarization, and the fidelity can reach 100% in principle. Our scheme is attractive and scalable, since it can be realized with artificial solid-state quantum systems. With developed experimental technique on controlling emitter-waveguide systems, the repeater may be very useful in long-distance quantum communication.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4923889 | PMC |
| http://dx.doi.org/10.1038/srep28744 | DOI Listing |
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Article Synopsis
- This study reports on the creation of advanced quantum light sources using electrically controlled semiconductor quantum dots coupled with circular Bragg grating resonators, aimed at enhancing photon emission for quantum technologies.
- The researchers achieved impressive results, including a photon extraction efficiency of up to 30.4% and potential improvements suggesting over 50%, demonstrating significant advancements in the performance of these devices.
- Additionally, they noted high levels of single-photon purity (99.2%) and photon indistinguishability (75%), which are crucial for applications in photonic quantum information systems.
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