Displaying items by tag: Quantum theory

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Usually, the interaction of an open quantum system with a noisy environment causes an irreversible loss of quantum coherence, which can be described by the Born-Markov approximation. Contrary, a non-Markovian environment (e.g. strong system-environment coupling) shows a pronounced 'memory effect', which can be used to revive quantum coherence as an alternative from shielding the environment. In this paper, Dong et al. show experimental results for such a non-Markovianity-assisted high-fidelity implementation of a quantum algorithm.

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Usually quantum information is encoded into a single, well-controlled degree of freedom, such as a spin. In some cases, however, establishing so called hyper-entanglement among several degrees-of-freedom (e.g. photon path, polarization and angular momentum), can be beneficial, e.g. improve the capacity of dense coding in linear optics.  In this paper, Li et al. propose a scheme that allows to combine both (single degree-of-freedom) entanglement and hyper-entanglement. Specifically, they show how two identical, initially separated particles can become spin-entangled, momenta-entangled and spin-and-momenta-hyper-entangled.

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Quantum states that violate Bell's inequality are all non-local states (entangled), but there are other states that do not violate a particular bell inequality but are still non-local. In this paper, Das et al. work with an inequality called I3322 (discovered by Collins et al.), which is inequivalent to the Bell-CHSH inequality (there are states that don't violate Bell-CHSH but do violate I3322), and construct a Bayesian game where a mixed entangled state provides higher individual payoffs than the classical equilibria and where the social welfare payoff is also increased beyond the upper limit for the classical scenario.

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