Entanglement-secured single-qubit quantum secret-sharing
| Autor: | Scherpelz, P., Resch, R., Berryrieser, D., Lynn, T. W. |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Physical Review A 84, 032303 (2011) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.84.032303 |
| Popis: | In single-qubit quantum secret sharing, a secret is shared between N parties via manipulation and measurement of one qubit at a time. Each qubit is sent to all N parties in sequence; the secret is encoded in the first participant's preparation of the qubit state and the subsequent participants' choices of state rotation or measurement basis. We present a protocol for single-qubit quantum secret sharing using polarization entanglement of photon pairs produced in type-I spontaneous parametric downconversion. We investigate the protocol's security against eavesdropping attack under common experimental conditions: a lossy channel for photon transmission, and imperfect preparation of the initial qubit state. A protocol which exploits entanglement between photons, rather than simply polarization correlation, is more robustly secure. We implement the entanglement-based secret-sharing protocol with 87% secret-sharing fidelity, limited by the purity of the entangled state produced by our present apparatus. We demonstrate a photon-number splitting eavesdropping attack, which achieves no success against the entanglement-based protocol while showing the predicted rate of success against a correlation-based protocol. Comment: 10 pages, 8 figures |
| Databáze: | arXiv |
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