Efficient long-range distribution of multi-photon entanglement



Faculty of Physics, University of Warsaw

April 29, 2021 3:15 AM


We demonstrate a protocol to perform long-distance quantum communications which outperforms the state-of-the-art protocols in efficiency, verifiability and versatility. Our scheme uses resources provided by the current quantum photonic technology: multi-photon bipartite entanglement and photon-number-resolving detectors. We show that it is robust even to extremely high transmission losses (e.g. such as 40 dB and higher) and that even then it offers outstanding success rates (160 Hz for typical atmospheric attenuation) in distributing near-maximally entangled states. Importantly, the amount of distributed entanglement can be verified by a loophole-free Bell test using the CHSH inequality. The protocol can be realised in a delayed-choice scheme without compromising its performance and freeing it from the necessity of using quantum memories. All things considered, it is the perfect scheme to establish an Earth-to-space quantum channel. In addition, it can act as a source of entanglement in versatile applications, e.g. quantum metrology and quantum key distribution.


Zoom meeting details 

Topic: Quantum Information and Quantum Computing Working Group
Time: April 29, 2021, 3:15 PM Warsaw
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Meeting ID: 96294497969
Passcode: 729533

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