Protecting, enhancing, and reviving entanglement

Abstract

We propose a strategies not only to protect but also to enhance and revive the entanglement in a double Jaynes-Cummings model. We show that such surprising features arises when Zeno-like measurements are performed during the dynamical process.

Multipartite nonlocality in a thermalized Ising spin chain

“…Of course one should be mindful of how any such system can be experimentally generated and utilized and of the fact that unavoidable interactions with a surrounding environment result in the loss of such strong quantum correlations. Methods to control the effect of these unwanted interactions (resulting in either losses or pure decoherence) have been proposed, ranging from bang-bang techniques [9] to the active use of the quantum Zeno effect [10]. All such methods, to the best of our knowledge, require either heavy influences on the system at hand or expensive additional resources for entanglement protection.…”

Environment induced quantum Zeno effect in coupled microwave cavities

“…The control and protection of quantum states are essential for the development of quantum information and quantum computation [10]. Recent contributions show that the QZE can also be used to protect entanglement from decoherence [11] and to control sudden death of entanglement [12]. Usually, in both theoretical and experimental investigations, the QZE is induced by frequent measurements.…”

Non-Markovianity during the quantum Zeno effect

“…The latter feature may be exploited to explore potential applications in quantum control [35,36] and information processing [37] involving periodic measurements, which can produce either a Zeno effect or an anti-Zeno effect, depending on the parameters of the system. The possibility of protecting quantum states via the Zeno effect has been shown in earlier works [38][39][40]. In this work, we highlight the appearance of non-Markovian signatures during the Zeno and anti-Zeno dynamics in specific two-qubit partitions of the spin-boson-reservoir system, with a broader aim of demonstrating that the context of non-Markovianity can reveal an alternative phenomenological perspective of the quantum Zeno effect.…”