Journal
JOURNAL OF MATHEMATICAL PHYSICS
Volume 54, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4819499
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Funding
- Polish Ministry of Science and Higher Education Iuventus Plus Grant [IP2011048471]
- Deutsche Forschungsgemeinschaft (DFG) [SFB/TR12]
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Given L-qubit states with the fixed spectra of reduced one-qubit density matrices, we find a formula for the minimal number of invariant polynomials needed for solving local unitary (LU) equivalence problem, that is, problem of deciding if two states can be connected by local unitary operations. Interestingly, this number is not the same for every collection of the spectra. Some spectra require less polynomials to solve LU equivalence problem than others. The result is obtained using geometric methods, i.e., by calculating the dimensions of reduced spaces, stemming from the symplectic reduction procedure. (C) 2013 AIP Publishing LLC.
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