Journal
PHYSICAL REVIEW A
Volume 78, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.78.052333
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Funding
- Polish budget funds [P03B 011 29]
- European Commission
- IST directorate [015848]
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The optimal N qubit states featuring highest sensitivity to small misalignment of Cartesian reference frames are found using the quantum Cramer-Rao bound. It is shown that the optimal states are supported on the symmetric subspace and hence are mathematically equivalent to a single spin J=N/2. Majorana representation of spin states is used to reveal a beautiful connection between the states optimal for aligning reference frames and the platonic solids.
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