Permutationally invariant quantum tomography

Details Permutationally invariant quantum tomography Permutationally invariant quantum tomography

2010-05-18

arxiv.org/abs/1005.3313v4

Phys. Rev. Lett. 105, 250403 (2010)

Physics

Quantum Physics

4 pages including 5 figures, 3-page appendix with 2 figures, revtex4; v2: shortened, some references added; v3: Observation 2

Scientific paper

10.1103/PhysRevLett.105.250403

We present a scalable method for the tomography of large multiqubit quantum registers. It acquires information about the permutationally invariant part of the density operator, which is a good approximation to the true state in many, relevant cases. Our method gives the best measurement strategy to minimize the experimental effort as well as the uncertainties of the reconstructed density matrix. We apply our method to the experimental tomography of a photonic four-qubit symmetric Dicke state.

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