We propose a scheme for the generation of entangled states for two atoms trapped in separate cavities coupled to each other. The scheme is based on the competition between the unitary dynamics induced by the classical fields and the collective decays induced by the dissipation of two delocalized field modes. Under certain conditions, the symmetric or asymmetric entangled state is produced in the steady state. The analytical result shows that the distributed steady entanglement can be achieved with high fidelity independent of the initial state, and is robust against parameter fluctuations. We also find out that the linear scaling of entanglement fidelity has a quadratic improvement compared to distributed entangled state preparation protocols based on unitary dynamics.There have been various practical applications for quantum entangled states, ranging from quantum teleportation [1, 2] to universal quantum computation [3,4]. The main obstacle in preserving entanglement is decoherence induced by the environment. Recently, dissipative state preparation has become a focus in quantum computation and entanglement engineering [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], which uses decoherence as a powerful resource without destroying the quantum entanglement. These schemes are robust against parameter fluctuations, obtain high fidelity entanglement with arbitrarily initial states, and do not need accurate control of the evolution time. Particularly, Kastoryano and Reiter et al. [5,6] proposed a novel scheme for dissipative preparation of entanglement for two atoms in an optical cavity which gets a qualitative improvement in the scaling of the fidelity with optimal cavity parameters as compared to any state preparation protocol with coherent unitary dynamics. However, most of the previous theoretical schemes and experiments [21] concentrate on the case in which two atoms are trapped in a single cavity.For distributed quantum information processing, it is a basic requirement to perform state transfer and quantum gate operation between separate nodes of a quantum network. To overcome the difficulty of individual addressability existing in a single cavity, efforts have been devoted to the coupled-cavity models both theoretically [22][23][24][25][26][27][28] and experimentally [29]. Most works on the coupled-cavity system focused on the traditional coherent unitary dynamics, requiring precise timing and special initial states. Clark et al. [30] proposed a scheme to entangle the internal states of atoms in separate optical cavities using technique of quantum reservoir engineering, however the scheme requires a complex atomic level configuration. Furthermore, the evolution towards the steady state slows down as the entanglement of the desired state increases.In this paper, we generalize the idea of Refs. [5, 6] * sbzheng@pub5.fz.fj.cn and propose a scheme for producing distributed entanglement for two atoms trapped in coupled cavities. Due to the coherent photon hopping between the two cavities, the system is m...
We propose a scheme for dissipative preparation of W-type entangled steady states of three atoms trapped in an optical cavity. The scheme is based on the competition between the decay processes into and out of the target state. By suitable choice of system parameters, we resolve the whole evolution process and employ the effective operator formalism to engineer four independent decay processes so that the target state becomes the stationary state of the quantum system. The scheme requires neither the preparation of definite initial states nor precise control of system parameters and preparation time.
Optomechanical systems couple light to the motion of nanomechanical objects. Intriguing new effects are observed in recent experiments that involve the dynamics of more than one optical mode. There, mechanical motion can stimulate strongly driven multi-mode photon dynamics that acts back on the mechanics via radiation forces. We show that even for two optical modes Landau-Zener-Stueckelberg oscillations of the light field drastically change the nonlinear attractor diagram of the resulting phonon lasing oscillations. Our findings illustrate the generic effects of Landau-Zener physics on back-action induced self-oscillations.The exploration of nanomechanical objects and their interaction with light constitutes the rapidly evolving field of optomechanics (see [1,2] for recent reviews). The key element of any optomechanical system is a laser-driven optical mode whose resonance frequency shifts in response to the displacement of a mechanical object. The photon dynamics conversely acts back on the mechanics in terms of a radiation pressure force. These dynamical back-action effects,
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