Symmetry and Decoherence-Free Subspaces in Quantum Neural Networks

摘要

Evolution of quantum states of array of quantum dots is analyzed by means of numerical solution of the von Neumann equation. For two qubit system with dipole-dipole interaction and common phonon bath the evolution of the symmetric state annotation encodingleads to the mixture of the triplet states, leaving the singlet decoupled. For three qubit system mml:semantics(D1/2 circle times 3=D3/2+2 with common phonon bath we observed similar effects within the quartet state D-3/2 if all qubits were symmetrically connected.