Significant-Loophole-Free Test of Bell's Theorem with Entangled Photons.
A Bell test is reported that closes the most significant of loopholes that provide loopholes for a local realist explanation of quantum mechanics, using a well-optimized source of entangled photons, rapid setting generation, and highly efficient superconducting detectors.
Entanglement-based quantum communication over 144km
Quantum entanglement is the main resource to endow the field of quantum information processing with powers that exceed those of classical communication and computation. In view of applications such…
Experimental Demonstration of Free-Space Decoy-State Quantum Key Distribution over 144 km
- T. Schmitt-Manderbach, H. Weier, H. Weinfurter
- PhysicsEuropean Conference on Lasers and Electro-Optics…
- 5 January 2007
This link between the Canary islands of La Palma and Tenerife has a path length much longer than from LEO satellites to a ground station and serves as a realistic test bed for future quantum communication to space.
Bell violation using entangled photons without the fair-sampling assumption
This experiment makes the photon the first physical system for which each of the main loopholes has been closed, albeit in different experiments, and uses the Eberhard form of Bell’s inequality, which allows a lower collection efficiency than other forms.
Satellite-Relayed Intercontinental Quantum Network.
The Micius satellite is confirmed as a robust platform for quantum key distribution with different ground stations on Earth, and points towards an efficient solution for an ultralong-distance global quantum network.
Violation of local realism with freedom of choice
- T. Scheidl, R. Ursin, A. Zeilinger
- PhysicsProceedings of the National Academy of Sciences
- 19 November 2008
This paper presents an experiment that violates Bell’s inequality while simultaneously closing the locality loophole and addressing the freedom-of-choice loophole, also closing the latter within a reasonable set of assumptions.
Twisted light transmission over 143 km
- Mario Krenn, J. Handsteiner, A. Zeilinger
- Physics, Computer ScienceProceedings of the National Academy of Sciences
- 6 June 2016
The transmission of orbital angular momentum modes of light over a distance of 143 km between two Canary Islands is shown, indicating that with state-of-the-art adaptive optics systems, both classical communication and entanglement transmission is feasible over distances of more than 100 km.
Distributing entanglement and single photons through an intra-city, free-space quantum channel
- K. Resch, M. Lindenthal, A. Zeilinger
- PhysicsEQEC '05. European Quantum Electronics Conference…
- 3 January 2005
The polarization correlations contained in the measured time tags are sufficient to convincingly violate a CHSH-Bell inequality and demonstrate entanglement between the two city buildings.
De Broglie wavelength of a non-local four-photon state
- P. Walther, Jian-Wei Pan, M. Aspelmeyer, R. Ursin, S. Gasparoni, A. Zeilinger
- 24 December 2003
A four-photon interferometer based on linear optics is demonstrated, demonstrating the presence of a four-particle mode-entangled state and anticipating that this scheme should be extendable to arbitrary photon numbers, holding promise for realizable applications with entanglement-enhanced performance.
Experimental verification of the feasibility of a quantum channel between space and Earth
Extending quantum communication to space environments would enable us to perform fundamental experiments on quantum physics as well as applications of quantum information at planetary and…