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Laser Physics Letters

Dynamics and protection of quantum discord via cavity engineering

Abdul Basit, Hamad Ali, Fazal Badshah, Haiyang Zhang, Guo-Qin Ge

Published Nov 14, 2017• 6 citations
Publisher

Abstract

Abstract Exploring strategies to protect quantum correlations from the detrimental effects of their surroundings is crucial in the field of quantum computing and information sciences. For this purpose, we consider a simple engineered environment consisting of two noninteracting separated qubits, each embedded in a single-mode lossy cavity which is further connected to another lossy cavity. We investigate the dynamics and protection of quantum discord for the initially maximum entangled state in the weak and strong coupling regimes between the qubits and their corresponding cavities. It is found that the quantum discord can be preserved efficiently for a much longer time by adjusting the hopping strengths between the two coupled cavities. In addition, if the secondary cavity is perfect then a stationary quantum discord between the two qubits arises after certain damping oscillations. Interestingly, the magnitude of the stationary quantum discord can be maximized by increasing the coupling strengths of the two cavities.

DOI
10.1088/1612-202x/aa8bc8

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Abstract Exploring strategies to protect quantum correlations from the detrimental effects of their surroundings is crucial in the field of quantum computing and information sciences. For this purpose, we consider a simple engineered environment consisting of two noninteracting separated qubits, each embedded in a single-mode lossy cavity which is further connected to another lossy cavity. We investigate the dynamics and protection of quantum discord for the initially maximum entangled state in the weak and strong coupling regimes between the qubits and their corresponding cavities. It is found that the quantum discord can be preserved efficiently for a much longer time by adjusting the hopping strengths between the two coupled cavities. In addition, if the secondary cavity is perfect then a stationary quantum discord between the two qubits arises after certain damping oscillations. Interestingly, the magnitude of the stationary quantum discord can be maximized by increasing the coupling strengths of the two cavities.
Abstract Harnessing and protecting quantum entanglement from the detrimental effects of local environments is essential for quantum information and computation. With this aim, we present a simple scheme to preserve and control the quantum entanglement. The scheme consists of two coupled single-mode lossy cavities, each containing a qubit, which are in turn connected simultaneously with another two lossy cavities. We examine the protection of entanglement for initially maximal entangled state in both weak and strong coupling regimes. It is found that one can enhance the survival time of the entanglement expeditiously by adjusting the coupling strengths between the relevant cavities and increasing the number of auxiliary cavities. In addition, if the cavities without qubits do not lose photons then after certain damping oscillations the entanglement between two qubits becomes stable. Interestingly, the magnitude of the stable quantum entanglement depends not only on the hopping strengths but also on the number of contributing auxiliary cavities.
We investigate the dynamics of quantum correlations such as entanglement and quantum discord between two atoms in a lossy cavity. It is found that a stable quantum discord could be induced even when the atoms remain separable at all times. Also, we show that it is possible to amplify and protect the quantum discord under cavity decay for certain types of initial states. Moreover, entanglement decoherence-free subspaces are obtained which may be useful in quantum information and quantum computation.
Abstract In this present manuscript, we explore the possibility to preserve and manipulate of classical and quantum correlations initially present in a system of qubits, where each qubit is immersed in a cavity that is interacted with another cavity as an engineered environment. We consider the qubit entropy, entanglement of formation, quantum discord, and classical correlation for Markovian and non-Markovian regimes. We find that the correlations can be maintained and enhanced during the dynamics, which is a useful dynamical feature, by adjusting the strength coupling constant between cavities for weak- and strong- coupling regime (W- and S-CR). In particular, we have found that, for the case of perfect cavities, high values of correlations can be achieved during the evolution with respect to the strength coupling between cavities. The obtained results can provide more hints for future studies on the control of correlations with optimal conditions. By a specific selection of the model parameters, long-time preservation of correlations can be achieved without being affected by the decoherence.
In this study, we consider a composed system consisting of two identical non-interacting subsystems. Each sub-system is made of a moving qubit into a leaky cavity. The study of the dynamic of the composed system revealed that compared with the stationary qubits, entanglement, quantum discord and coherence between two moving qubits remained close to their initial values as time went by. In particular, we show that the entanglement, quantum discord and the initial coherence between the two qubits could be strongly protected from decay by increasing the velocity of the qubits. Furthermore, based on such results, we have drawn a comparison between the three quantum resources (entanglement, quantum discord and coherence), demonstrating that the coherence of a bipartite system could be more robust than the two other quantum resources.
We have studied the dynamics of quantum correlations such as entanglement, Bell nonlocality and quantum discord between identical and unidentical atoms interacting with a single-mode cavity field and subject to cavity decay. The effect of single-atom detuning, cavity decay rate and initial preparation of the atoms on the corresponding correlation measures have been investigated. It is found that even under strong dissipation, time evolution can create high quantum discord while entanglement and Bell nonlocality stay zero for an initially separable state. Quantum discord increases while entanglement decreases in a certain time period under dissipation for the initial state that both atoms are in the excited state if the qubits are identical. For some types of initial states, cavity decay is shown to drive the system to a stationary state with high entanglement and quantum discord.
The dynamics of quantum discord for two identical qubits in two independent single-mode cavities and a common single-mode cavity are discussed. For the initial Bell state with correlated spins, while the entanglement sudden death can occur, the quantum discord vanishes only at discrete moments in the independent cavities and never vanishes in the common cavity. Interestingly, quantum discord and entanglement show opposite behavior in the common cavity, unlike in the independent cavities. For the initial Bell state with anti-correlated spins, quantum discord and entanglement behave in the same way for both independent cavities and a common cavity. It is found that the detunings always stabilize the quantum discord.