High-quality three-dimensional photonic crystal (PC) heterostructures were fabricated using the modified self-assembly method, and their structural and optical properties were analyzed. Results suggest that the optical quality of heterostructures formed by depositing bigger particles on small ones is superior to that of heterostructures formed by stacking smaller particles on big ones, due to the rough interface effects in the latter structure. The roughness of the interface in the latter structure can be largely improved by introducing a thin two-dimensional planar defect layer into the PCs, and significant progress in the quality of the heterostructures is achieved. The important role of the thin planar defect layer in the quality of the heterostructures was also verified by numerical simulations.
A different strategy is proposed to control decoherence from fluctuating magnetic field by adjusting external controllable parameters. The results show that the output states in terms of the fidelity are pure states, which correspond to the state vectors that are given by a renormalized Hamiltonian. Thus, the output states may perfectly preserve memory of initial single-qubit states at some critical magnetic field parameters.Keywords Decoherence · Controllable parameter · Fluctuating magnetic field In a really physical word, the interaction between a quantum system with its surrounding environment may lead to an irreversible loss of information on the system. Because the interacting effect is that quantum superpositions decay into statistical mixtures so as to result in a relatively short coherence time, the decoherent process limits the ability to maintain pure quantum states in quantum information processing [1-3]. Thus, noise and decoherence are a major challenge how to preserve quantum coherent state in practical applications [4][5][6][7][8][9].Several schemes have been proposed to solve the problem, which included quantum error correction strategies [10][11][12][13], feedback implementations [14][15][16], the realization of qubits in symmetric subspaces decoupled from the environment [17][18][19], dynamical decoupling techniques [20,21], and engineering of pointer states [22]. Though the engineering of pointer states and feedback implementations were proposed to maintain a single-qubit
Photonic crystal heterostructures constituting of two photonic crystals with different lattice constants are fabricated using the modified self-assembly method and their structural and optical properties are investigated. The results show that these photonic crystal heterostructures of high quality possess deep photonic band gaps and steep photonic band edges in their transmission spectra. Deep double photonic band gaps, steep photonic band edges and high transmittance in the pass band show good ordering of the heterostructure and may offer a probability for studying late-model ultra-fast all-optical switches.
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