Suppose a 2 x 2 matrix X (not necessarily Hermitian. nor unitary) is written as X =
Question:
Suppose a 2 x 2 matrix X (not necessarily Hermitian. nor unitary) is written as X = α0 + σ ∙ a, where α0 and α1, 2, 3 are numbers.
a. How are α0 and αk (k = 1, 2, 3) related to tr (X) and tr (σk X)?
b. Obtain α0 and αk in terms of the matrix elements Xij.
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a X a 20 trx because tr ek 2 26 x 28 where we have used I ...View the full answer
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