For spin-1/2 systems, arbitrary unitary transformations can be implemented under exact angular-momentum conservation, with each component of the system's angular-momentum change stored in a separate part of the reference frame to arbitrary precision.
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Reference frames which separately store non-commuting conserved quantities
For spin-1/2 systems, arbitrary unitary transformations can be implemented under exact angular-momentum conservation, with each component of the system's angular-momentum change stored in a separate part of the reference frame to arbitrary precision.