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Article
Geometric Phase of Time-Dependent Superconducting Qubit
Geometric phases are studied in terms of invariant operator for a time-dependent superconducting qubit. The results show that the geometric phase depends on the dipole interaction strength between the qubit an...
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Article
Entanglement Dynamics and its Application for Two Qubits in Dissipative Environment
An entanglement dynamics of two dissipative qubits under different situation of initial conditions is studied. We find that the periodic disentanglement and entanglement results from the interaction between tw...
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Article
Fidelity and Entanglement with Environment Effect
A quantum entangling gate is investigated in dissipative system by considering input initial entangled two qubits. By analyzing the relation between the fidelity and the concurrence, we find that the fidelity ...
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Article
Entangled Subspaces for Two Coupled Qubits in a Normal Environment
By investigating the effect of environmental perturbations on two initially coupled qubits, we find that the interactions between the qubits and between the qubits and the environment are not only the source o...
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Article
Geometric Phase for Optical Free Induction Decay
Geometric phase is investigated for optical free induction decay with a modified Bloch equation by establishing in connecting density matrices with nonunit vector ray in a complex projective Hilbert space. Und...
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Article
Geometric Population Inversion in Rabi Oscillation
The relations between geometric phases and population inversion in Rabi oscillation are investigated for all possible cases. The results show that the population inverse is an elliptically symmetric distributi...
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Article
Controlling Decoherence from Fluctuating Magnetic Field
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 ...
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Article
Avoiding Loss of Fidelity for Universal Entangling Geometric Quantum Gate
A strategy to perfectly preserve the two-qubit state is investigated in geometric quantum computation for nuclear magnetic resonance system. The results show that, by controlling the azimuthal angle in the ini...