Journal
NATURE PHYSICS
Volume 12, Issue 3, Pages 218-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS3605
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Funding
- NCCR Quantum Photonics (NCCR QP)
- Swiss National Science Foundation (SNSF)
- Swiss NSF [200020-159196]
- Swiss National Science Foundation (SNF) [200020_159196] Funding Source: Swiss National Science Foundation (SNF)
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Quantum entanglement emerges naturally in interacting quantum systems and plays a central role in quantum information processing(1-4). 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 photon(5). Here, we demonstrate such heralded quantum entanglement(6-9) of two quantum-dot hole spins separated by 5m using single-photon interference. Thanks to fast spin initialization in 10 ns, hole-spin coherence lasting similar to 40 ns and efficient photon extraction from dots(10-12) 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 experiments(13). 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 qubit(14), fast entanglement generation could impact quantum repeater architectures.
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