Entanglement, purity and energy: Two qubits vs Two modes

Details Entanglement, purity and energy: Two qubits vs Two modes Entanglement, purity and energy: Two qubits vs Two modes

2006-07-03

arxiv.org/abs/quant-ph/0607012v3

Physics

Quantum Physics

13 figures. References and 1 figure added

Scientific paper

10.1103/PhysRevA.74.042303

We study the relationship between the entanglement, mixedness and energy of two-qubit and two-mode Gaussian quantum states. We parametrize the set of allowed states of these two fundamentally different physical systems using measures of entanglement, mixedness and energy that allow us to compare and contrast the two systems using a phase diagram. This phase diagram enables one to clearly identify not only the physically allowed states, but the set of states connected under an arbitrary quantum operation. We pay particular attention to the maximally entangled mixed states (MEMS) of each system. Following this we investigate how efficiently one may transfer entanglement from two-mode to two-qubit states.

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