Distillation of Quantum Steering
| Autor: | Stephen P. Walborn, P. Sahium, Leandro Aolita, R. V. Nery, G. H. Aguilar, M. M. Taddei |
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| Rok vydání: | 2019 |
| Předmět: |
Quantum Physics
Quantum network Photon Computer science General Physics and Astronomy FOS: Physical sciences Topology 01 natural sciences Encoding (memory) 0103 physical sciences Fraction (mathematics) State (computer science) Limit (mathematics) 010306 general physics Quantum Physics (quant-ph) Protocol (object-oriented programming) Quantum |
| Zdroj: | Physical review letters. 124(12) |
| ISSN: | 1079-7114 |
| Popis: | We show -- both theoretically and experimentally -- that Einstein-Podolsky-Rosen steering can be distilled. We present a distillation protocol that outputs a perfectly correlated system -- the singlet assemblage -- in the asymptotic infinite-copy limit, even for inputs that are arbitrarily close to being unsteerable. As figures of merit for the protocol's performance, we introduce the assemblage fidelity and the singlet-assemblage fraction. These are potentially interesting quantities on their own beyond the current scope. Remarkably, the protocol works well also in the non-asymptotic regime of few copies, in the sense of increasing the singlet-assemblage fraction. We demonstrate the efficacy of the protocol using a hyperentangled photon pair encoding two copies of a two-qubit state. This represents to our knowledge the first observation of deterministic steering concentration. Our findings are not only fundamentally important but may also be useful for semi device-independent protocols in noisy quantum networks. Comment: 6+4 pages, 3 figures. Accepted for publication in Physical Review Letters |
| Databáze: | OpenAIRE |
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