Experimental demonstration of memory-enhanced quantum communication

By M. Bhaskar, R. Riedinger, B. Machielse, D. Levonian, C. Nguyen, E. Knall, Hongkun Park, D. Englund, M. Lonvcar, D. Sukachev and 1 more. Nature, 2019

601 citations recorded by the source corpus.

The ability to communicate quantum information over long distances is of central importance in quantum science and engineering1. Although some applications of quantum communication such as secure quantum key distribution2,3 are already being successfully deployed4–7, their range is currently limited by photon losses and cannot be extended using straightforward measure-and-repeat strategies without compromising unconditional security8. Alternatively, quantum repeaters9, which utilize intermediate quantum memory nodes and error correction techniques, can extend the range of quantum channels. However, their implementation remains an outstanding challenge10–16, requiring a combination of efficient and high-fidelity quantum memories, gate operations, and measurements. Here we use a single solid-state spin memory integrated in a nanophotonic diamond resonator17–19 to implement asynchronous photonic Bell-state measurements, which are a key component of quantum repeaters. In a proof-of-principle experiment, we demonstrate high-fidelity operation that effectively enables quantum communication at a rate that surpasses the ideal loss-equivalent direct-transmission method while operating at megahertz clock speeds. These results represent a crucial step towards practical quantum repeaters and large-scale quantum networks20,21. A solid-state spin memory is used to demonstrate quantum repeater functionality, which has the potential to overcome photon losses involved in long-distance transmission of quantum information.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/6a4b5771b25aa8dc41c70c17a2c15cccc471648d

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Citations in the corpus

One-Way Quantum Repeater Based on Near-Deterministic Photon-Emitter Interfaces (2019, background): “Notably, both high cooperativity and combined detection and in-out coupling efficiencies above 90% have recently been reported with a SiV defect center coupled to a nanophotonic cavity [55].”
2022 Roadmap on integrated quantum photonics (2021, background): “This property has enabled the realization of an integrated, SiV-controlled single photon switch [60], coherent interaction of two SiV spins through the optical mode of a photonic cavity [149], and memory-enhanced photonic Bell-state measurements [150] (see figures 21(a) and (b)).”
Development of Quantum Interconnects (QuICs) for Next-Generation Information Technologies (2021, background): “Recently efficient quantum optical interfaces have been realized using integrated nanophotonic devices for both trapped neutral atoms[29] and diamond color centers [30].”
Integrated Quantum Photonics with Silicon Carbide: Challenges and Prospects (2020, background): “[21,110,111], cavity-mediated spin-spin interactions [24], and nuclear spin quantum register [10]) have so far been”