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- W2041755992 abstract "Quantum effects are represented by operators on a Hilbert space satisfying 0⩽A⩽I, and sharp quantum effects are represented by projection operators. We say that an effect A is almost sharp if A=PQP for projections P and Q. We give simple characterizations of almost sharp effects. We also characterize effects that can be written as longer products of projections. For generality we first work in the formalism of von Neumann algebras. We then specialize to the full operator algebra B(H) and to finite dimensional Hilbert spaces." @default.
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- W2041755992 date "2004-10-25" @default.
- W2041755992 modified "2023-09-23" @default.
- W2041755992 title "Almost sharp quantum effects" @default.
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- W2041755992 doi "https://doi.org/10.1063/1.1806532" @default.
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