2,144 research outputs found
Minimum output entropy of a non-Gaussian quantum channel
We introduce a model of non-Gaussian quantum channel that stems from the
combination of two physically relevant processes occurring in open quantum
systems, namely amplitude damping and dephasing. For it we find input states
approaching zero output entropy, while respecting the input energy constraint.
These states fully exploit the infinite dimensionality of the Hilbert space.
Upon truncation of the latter, the minimum output entropy remains finite and
optimal input states for such a case are conjectured thanks to numerical
evidences
Entanglement dynamics for qubits dissipating into a common environment
We provide an analytical investigation of the entanglement dynamics for a
system composed of an arbitrary number of qubits dissipating into a common
environment. Specifically we consider initial states whose evolution remains
confined on low dimensional subspaces of the operators space. We then find for
which pairs of qubits entanglement can be generated and can persist at steady
state. Finally, we determine the stationary distribution of entanglement as
well as its scaling versus the total number of qubits in the system
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