Question
A measure named for these functions is sandwiched between a linear operator and its adjoint to Naimark dilate a different measure into higher dimensions. In quantum information theory, one of these functions corresponding to a “typical” space satisfies a lower bound trace condition of “one minus epsilon” asymptotically. Positive operator-valued measures, or P·O·V·Ms, (*) generalize a type of measure that maps from sets to these functions. The density matrix for a pure state, but not a mixed state, is one of these functions. One of these functions can be written as “ket psi bra psi.” A namesake “postulate” of quantum mechanics treats measurement as applying one of these operators for a given eigenstate. For 10 points, name these idempotent operators that map onto a subspace. ■END■
ANSWER: projection operators [or orthogonal projection or projector; accept projection-valued measures; prompt on outer products by asking “what is this achieving geometrically?”]
<Tim Morrison, Physics>
= Average correct buzz position
| Conv. % | Power % | Average Buzz |
|---|
| 78% | 0% | 115.71 |
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