Resource-Efficient Measurement-Device-Independent Entanglement Witness.
- Verbanis E Group of Applied Physics, University of Geneva, 1211 Geneva, Switzerland.
- Martin A Group of Applied Physics, University of Geneva, 1211 Geneva, Switzerland.
- Rosset D Group of Applied Physics, University of Geneva, 1211 Geneva, Switzerland.
- Lim CC Group of Applied Physics, University of Geneva, 1211 Geneva, Switzerland.
- Thew RT Group of Applied Physics, University of Geneva, 1211 Geneva, Switzerland.
- Zbinden H Group of Applied Physics, University of Geneva, 1211 Geneva, Switzerland.
- 2016-05-28
Published in:
- Physical review letters. - 2016
English
Imperfections in experimental measurement schemes can lead to falsely identifying, or over estimating, entanglement in a quantum system. A recent solution to this is to define schemes that are robust to measurement imperfections-measurement-device-independent entanglement witness (MDI-EW). This approach can be adapted to witness all entangled qubit states for a wide range of physical systems and does not depend on detection efficiencies or classical communication between devices. Here we extend the theory to remove the necessity of prior knowledge about the two-qubit states to be witnessed. Moreover, we tested this model via a novel experimental implementation for MDI-EW that significantly reduces the experimental complexity. By applying it to a bipartite Werner state, we demonstrate the robustness of this approach against noise by witnessing entanglement down to an entangled state fraction close to 0.4.
- Language
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- English
- Open access status
- hybrid
- Identifiers
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- DOI 10.1103/PhysRevLett.116.190501
- PMID 27232009
- Persistent URL
- https://sonar.ch/global/documents/232466
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