Generation of heralded entanglement between distant hole spins

By A. Delteil, Zhe Sun, Wei-bo Gao, E. Togan, S. Faelt, A. Imamoğlu. Nature Physics, 2015

320 citations recorded by the source corpus.

The detection of a single photon heralds the projection of two remote spins onto a maximally entangled state. This has been demonstrated for quantum-dot hole spins, featuring a fast generation rate that could enable quantum technology applications. Quantum entanglement emerges naturally in interacting quantum systems and plays a central role in quantum information processing1,2,3,4. But the generation of entanglement does not require direct interactions: single-photon detection in spin-flip Raman scattering projects two distant spins onto a maximally entangled state, provided that it is impossible to determine the source of the detected photon5. Here, we demonstrate such heralded quantum entanglement6,7,8,9 of two quantum-dot hole spins separated by 5 m using single-photon interference. Thanks to fast spin initialization in 10 ns, hole-spin coherence lasting ∼40 ns and efficient photon extraction from dots10,11,12 embedded in leaky microcavity structures, we generate 2,300 entangled spin pairs per second, which represents a 1,000-fold improvement as compared to previous experiments13. The delayed two-photon interference scheme we developed allows the efficient verification of quantum correlations. Combined with schemes for transferring quantum information to a long-lived memory qubit14, fast entanglement generation could impact quantum repeater architectures.

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

View Paper: https://www.semanticscholar.org/paper/7082b9b63dced0a7407e6cdf0e6999497b2df060

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In Atomic and Molecular Physics, and Optics

Citations in the corpus

Deterministic delivery of remote entanglement on a quantum network (2017, background): “Recent experiments have highlighted the potential of such single-photon protocols by generating local entanglement [23, 24], and remote entanglement in post-selection [18, 19].”
Quantum internet: A vision for the road ahead (2018, background): “The generation of photon-mediated entanglement between distant matter qubits has been achieved with trapped ions (72), atoms (73, 74), nitrogen-vacancy (N-V) centers indiamond (75), and semiconductor quantum dots (76, 77) over distances up to 1.”
Quantum-dot based photonic quantum networks (2017, background): “A further extension of this experiment was the demonstration of heralded entanglement between two spatially separate hole spins in QDs [52], cf.”
A Survey on Quantum Channel Capacities (2018, background): “can be realised by Entanglement Swapping (ES) [386-388] or by QNC [363, 365, 389].”
A link layer protocol for quantum networks (2019, background): “quantum dots [32], rare earth ion-doped crystals [84], atomic gases [25, 50], and superconducting qubits [65]), but their performance is not yet”