Spin geometry of entangled qubits under bilocal decoherence modes

Details Spin geometry of entangled qubits under bilocal decoherence modes Spin geometry of entangled qubits under bilocal decoherence modes

2007-07-25

arxiv.org/abs/0707.3774v1

Phys. Lett. A 372 (2008) 1789 - 1798

Physics

Quantum Physics

12 pages, 3 figures

Scientific paper

10.1016/j.physleta.2007.10.073

The Lindblad generators of the master equation define which kind of decoherence happens in an open quantum system. We are working with a two qubit system and choose the generators to be projection operators on the eigenstates of the system and unitary bilocal rotations of them. The resulting decoherence modes are studied in detail. Besides the general solutions we investigate the special case of maximally entangled states - the Bell singlet states. The results are depicted in the so-called spin geometry picture which allows to illustrate the evolution of the (nonlocal) correlations stored in a certain state. The question for which conditions the path traced out in the geometric picture depends only on the relative angle between the bilocal rotations is addressed.

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