Bright and dark periods in the entanglement dynamics of interacting qubits in contact with the environment
Sumanta Das, Girish Saran Agarwal · Journal of Physics B Atomic Molecular and Optical Physics · 2009
Abstract. Interaction among the qubits are basis to many quantum logic operations. We report how such inter-qubit interactions can lead to new features, in the form of bright and dark periods in the entanglement dynamics of two qubits subject to environmental perturbations. These features are seen to be precursors to the well known phenomenon of sudden death of entanglement [Yu & Eberly, Phys. Rev. Lett. 93, 140404 (2004)] for noninteracting qubits. Further we find that the generation of bright and dark periods are generic and occur for wide varieties of the models of environment. We present explicit results for two popular models. PACS numbers: 03.65.Yz, 03.65.Ud, 42.50.LcBright and Dark periods in the Entanglement Dynamics of Interacting Qubits in Contact with the Environme One of the prime requirements for quantum computation is designing logic gates that can be used to implement algorithms based on the principles of quantum mechanics [1]. During the last decade substantial theoretical understanding and technological advancement has been acquired in this respect [2]. In analogy to the fundamental gates like XOR in boolean logic, it has been shown that the two qubit logic gate along with single qubit rotation can perform fundamental logic operations (C-NOT)