| Autor: |
Pont, Mathias, Corrielli, Giacomo, Fyrillas, Andreas, Agresti, Iris, Carvacho, Gonzalo, Maring, Nicolas, Emeriau, Pierre-Emmanuel, Ceccarelli, Francesco, Albiero, Ricardo, Ferreira, Paulo H. D., Somaschi, Niccolo, Senellart, Jean, Sagnes, Isabelle, Morassi, Martina, Lemaitre, Aristide, Senellart, Pascale, Sciarrino, Fabio, Liscidini, Marco, Belabas, Nadia, Osellame, Roberto |
| Rok vydání: |
2022 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
Mutually entangled multi-photon states are at the heart of all-optical quantum technologies. While impressive progresses have been reported in the generation of such quantum light states using free space apparatus, high-fidelity high-rate on-chip entanglement generation is crucial for future scalability. In this work, we use a bright quantum-dot based single-photon source to demonstrate the high fidelity generation of 4-photon Greenberg-Horne-Zeilinger (GHZ) states with a low-loss reconfigurable glass photonic circuit. We reconstruct the density matrix of the generated states using full quantum-state tomography reaching an experimental fidelity to the target $|{\text{GHZ}_4}\rangle$ of $\mathcal{F}_{\text{GHZ}_4} (86.0\pm0.4)\,\%$, and a purity of $\mathcal{P}_{\text{GHZ}_4}=(76.3\pm0.6)\,\%$. The entanglement of the generated states is certified with a semi device-independent approach through the violation of a Bell-like inequality by more than 39 standard deviations. Finally, we carry out a four-partite quantum secret sharing protocol on-chip where a regulator shares with three interlocutors a sifted key with up to 1978 bits, achieving a qubit-error rate of $10.87\,\%$. These results establish that the quantum-dot technology combined with glass photonic circuitry for entanglement generation on chip offers a viable path for intermediate scale quantum computation and communication. |
| Databáze: |
arXiv |
| Externí odkaz: |
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