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| 2. |
- Gaertner, Sascha, et al.
(author)
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Experimental demonstration of a quantum protocol for byzantine agreement and liar detection
- 2008
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In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 100:7, s. 70504-
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Journal article (peer-reviewed)abstract
- We introduce a new quantum protocol for solving detectable Byzantine agreement (also called detectable broadcast) between three parties, and also for solving the detectable liar detection problem. The protocol is suggested by the properties of a four-qubit entangled state, and the classical part of the protocol is simpler than that of previous proposals. In addition, we present an experimental implementation of the protocol using four-photon entanglement.
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| 3. |
- Joshi, Siddarth Koduru, et al.
(author)
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Space QUEST mission proposal : experimentally testing decoherence due to gravity
- 2018
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In: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 20
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Journal article (peer-reviewed)abstract
- Models of quantum systems on curved space-times lack sufficient experimental verification. Some speculative theories suggest that quantum correlations, such as entanglement, may exhibit different behavior to purely classical correlations in curved space. By measuring this effect or lack thereof, we can test the hypotheses behind several such models. For instance, as predicted by Ralph et al [5] and Ralph and Pienaar [1], a bipartite entangled system could decohere if each particle traversed through a different gravitational field gradient. We propose to study this effect in a ground to space uplink scenario. We extend the above theoretical predictions of Ralph and coworkers and discuss the scientific consequences of detecting/failing to detect the predicted gravitational decoherence. We present a detailed mission design of the European Space Agency's Space QUEST (Space-Quantum Entanglement Space Test) mission, and study the feasibility of the mission scheme.
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| 4. |
- Laskowski, Wieslaw, et al.
(author)
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Interference contrast in multisource few-photon optics
- 2009
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In: Journal of Physics B. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 42:11, s. 114004-
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Journal article (peer-reviewed)abstract
- Many recent experiments employ several parametric down-conversion (PDC) sources to get multiphoton interference. Such interference has applications in quantum information. We study here how effects due to photon statistics, misalignment and partial distinguishability of the PDC pairs originating from different sources may lower the interference contrast in multiphoton experiments.
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| 5. |
- Trojek, Pavel, et al.
(author)
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Experimental multipartner quantum communication complexity employing just one qubit
- 2013
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In: Natural Computing. - : Springer Science and Business Media LLC. - 1567-7818 .- 1572-9796. ; 12:1, s. 19-26
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Journal article (peer-reviewed)abstract
- Most proposals for quantum solutions of information-theoretic problems rely on the usage of multi-partite entangled states which are still difficult to produce experimentally with current state-of-the-art technology. Here, we analyze a scheme to simplify a particular kind of multiparty communication protocols for the experiment. We prove that the fidelity of two communication complexity protocols, allowing for an N - 1 bit communication, can be exponentially improved by N - 1 (unentangled) qubit communication. Taking into account, for a fair comparison, all inefficiencies of state-of-the-art set-up, the experimental implementation for N = 5 outperforms the best classical protocol, making it the candidate for multi-party quantum communication applications.
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