Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.250403
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Funding
- Spanish MEC [FIS2009-12773-C02-02]
- Basque Government [IT4720-10]
- ERC StG GEDENTQOPT
- DFG-Cluster of Excellence MAP
- EU
- DAAD/MNISW
- QCCC of the Elite Network of Bavaria
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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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