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- W3158148677 abstract "One of the key ingredients of many LOCC protocols in quantum information is a multiparticle (locally) maximally entangled quantum state, aka a critical state, that possesses local symmetries. We show how to design critical states with arbitrarily large local unitary symmetry. We explain that such states can be realised in a quantum system of distinguishable traps with bosons or fermions occupying a finite number of modes. Then, local symmetries of the designed quantum state are equal to the unitary group of local mode operations acting diagonally on all traps. Therefore, such a group of symmetries is naturally protected against errors that occur in a physical realisation of mode operators. We also link our results with the existence of so-called strictly semistable states with particular asymptotic diagonal symmetries. Our main technical result states that the $N$th tensor power of any irreducible representation of $mathrm{SU}(N)$ contains a copy of the trivial representation. This is established via a direct combinatorial analysis of Littlewood-Richardson rules utilising certain combinatorial objects which we call telescopes." @default.
- W3158148677 created "2021-05-10" @default.
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- W3158148677 date "2021-05-01" @default.
- W3158148677 modified "2023-09-29" @default.
- W3158148677 title "Designing locally maximally entangled quantum states with arbitrary local symmetries" @default.
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- W3158148677 doi "https://doi.org/10.22331/q-2021-05-01-450" @default.
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