Certifying the presence of a photonic qubit by splitting it in two
| Autor: | Meyer-Scott, Evan, McCloskey, Daniel, Gołos, Klaudia, Salvail, Jeff Z., Fisher, Kent A. G., Hamel, Deny, Cabello, Adán, Resch, Kevin J., Jennewein, Thomas |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 116, 070501 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.116.070501 |
| Popis: | We present an implementation of photonic qubit precertification that performs the delicate task of detecting the presence of a flying photon without destroying its qubit state, allowing loss-sensitive quantum cryptography and tests of nonlocality even over long distance. By splitting an incoming single photon in two via parametric down-conversion, we herald the photon's arrival from an independent photon source while preserving its quantum information with up to $92.3\pm0.6$ % fidelity. With reduced detector dark counts, precertification will be immediately useful in quantum communication. Comment: 6 pages, 6 figures, updated to published version |
| Databáze: | arXiv |
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