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Mostrando ítems 61-70 de 80
Artículo
Graph-theoretic approach to dimension witnessing
(IOP Publishing, 2021-03)
A fundamental problem in quantum computation and quantum information is finding the minimum quantum dimension needed for a task. For tasks involving state preparation and measurements, this problem can be addressed using ...
Artículo
Two fundamental experimental tests of nonclassicality with qutrits
(Nature Publishing Group, 2013)
We report two fundamental experiments on three-level quantum systems (qutrits). The first one tests the simplest task for which quantum mechanics provides an advantage with respect to classical physics. The quantum ...
Artículo
Quantum key distribution without alternative measurements
(American Physical Society, 2000-04-18)
Entanglement swapping between Einstein-Podolsky-Rosen (EPR) pairs can be used to generate the same sequence of random bits in two remote places. A quantum key distribution protocol based on this idea is described. The ...
Artículo
Quantum contextuality, causality and freedom of choice
(The Royal Society, 2024-01-29)
The theme of this issue is ‘Quantum contextuality, causality and freedom of choice.’ Contextuality, including non-locality as its special case, has long since becomeone of the central topics in foundations of quantum ...
Artículo
Experimental observation of quantum contextuality beyond Bell nonlocality
(American Physical Society, 2019-10-22)
Bell nonlocality and quantum contextuality are two important resources which, however, behave very differently in many tasks where the quantum correlation has an edge over its classical counterpart. In this work, we directly ...
Artículo
Quantum contextuality provides communication complexity advantage
(American Physical Society, 2023-02-24)
Despite the conceptual importance of contextuality in quantum mechanics, there is a hitherto limited number of applications requiring contextuality but not entanglement. Here, we show that for any quantum state and observables ...
Artículo
Exponentially decreasing critical detection efficiency for any Bell inequality
(American Physical Society, 2022-11-30)
We address the problem of closing the detection efficiency loophole in Bell experiments, which is crucial for real-world applications. Every Bell inequality has a critical detection efficiency η that must be surpassed to ...
Artículo
Automated quantum operations in photonic qutrits
(American Physical Society, 2018-02-02)
We report an experimental implementation of automated state transformations on spatial photonic qutrits following the theoretical proposal made by Baldijão et al. [Phys. Rev. A 96, 032329 (2017)]. A qutrit state is simulated ...
Artículo
Optimal preparation of graph states
(American Physical Society, 2011)
We show how to prepare any graph state of up to 12 qubits with (a) the minimum number of controlled-Z gates and (b) the minimum preparation depth. We assume only one-qubit and controlled-Z gates. The method exploits the ...
Artículo
Robust self-testing of quantum systems via noncontextuality Inequalities
(American Physical Society, 2019-06-26)
Characterizing unknown quantum states and measurements is a fundamental problem in quantum information processing. In this Letter, we provide a novel scheme to self-test local quantum systems using noncontextuality ...