Multi-Bloch Vector Representation of the Qutrit

Details Multi-Bloch Vector Representation of the Qutrit Multi-Bloch Vector Representation of the Qutrit

2009-12-16

arxiv.org/abs/0912.3155v1

Physics

Quantum Physics

7 pages, 2 figures, 1 table, comments welcome

Scientific paper

An ability to describe quantum states directly by average values of measurement outcomes is provided by the Bloch vector. For an informationally complete set of measurements one can construct unique Bloch vector for any quantum state. However, not every Bloch vector corresponds to a quantum state. It seems that only for two dimensional quantum systems it is easy to distinguish proper Bloch vectors from improper ones, i.e. the ones corresponding to quantum states from the other ones. I propose an alternative approach to the problem in which more than one vector is used. In particular, I show that a state of the qutrit can be described by the three qubit-like Bloch vectors.

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