Physics – Quantum Physics
Scientific paper
2002-01-14
Physical Review A 66, 012303 (2002)
Physics
Quantum Physics
6 pages, 4 figures, submitted to PRA
Scientific paper
10.1103/PhysRevA.66.012303
Recently quantum tomography has been proposed as a fundamental tool for prototyping a few qubit quantum device. It allows the complete reconstruction of the state produced from a given input into the device. From this reconstructed density matrix, relevant quantum information quantities such as the degree of entanglement and entropy can be calculated. Generally orthogonal measurements have been discussed for this tomographic reconstruction. In this paper, we extend the tomographic reconstruction technique to two new regimes. First we show how non-orthogonal measurement allow the reconstruction of the state of the system provided the measurements span the Hilbert space. We then detail how quantum state tomography can be performed for multi qudits with a specific example illustrating how to achieve this in one and two qutrit systems.
Munro William J.
Nemoto Keiichi
Thew Rob T.
White Andrew G.
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