Decoherence modes of entangled qubits within neutron interferometry
Reinhold A. Bertlmann, Katharina Durstberger, Yuji Hasegawa · Physical Review A · 2006
We study two different decoherence modes for entangled qubits by considering a Liouville--von Neumann master equation. Mode A is determined by projection operators onto the eigenstates of the Hamiltonian and mode B by projectors onto rotated states. We present solutions for general and for Bell diagonal states and calculate for the latter the mixedness and the amount of entanglement given by the concurrence. We propose a realization of the decoherence modes within neutron interferometry by applying fluctuating magnetic fields. An experimental test of the Kraus operator decomposition describing the evolution of the system for each mode is presented.