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Most protocols on Quantum Teleportation (using Alice and Bob as performers) include a crucial step where Alice performs a Bell State Measurement. Usually the applicable math is given in the protocol, but many protocols make the following kind of statement with no explanation: "Alice must rotate her measurement apparatus to align with the Bell basis."

If you can, please clarify

(1) what devices or parts of the apparatus need to be rotated (?? beam splitters, gates, crystals) and where are these devices installed,

(2) how does Alice know by how much to rotate these,

(3) what are the mathematical effects of this action (e.g. how is the superposition changed), and

(4) what is the relationship between this action and the unitary operations Bob must perform to recover the teleported state?

Thank You!

Lou Jagerman

If you can, please clarify

(1) what devices or parts of the apparatus need to be rotated (?? beam splitters, gates, crystals) and where are these devices installed,

(2) how does Alice know by how much to rotate these,

(3) what are the mathematical effects of this action (e.g. how is the superposition changed), and

(4) what is the relationship between this action and the unitary operations Bob must perform to recover the teleported state?

Thank You!

Lou Jagerman

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