Is inner product a measurement in quantum computation?

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SUMMARY

Hams and Raedt introduced a quantum computational algorithm for calculating the density of states in a spin system by evolving an initial random state and subsequently taking the inner product with the evolved state. This inner product is crucial in understanding the measurement process within quantum computation. The discussion raises questions about whether the inner product of two qubits, such as , constitutes a measurement that destroys the qubits or if it is possible to extract information without affecting their state.

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Hams and Raedt gave a quantum computational algorithm to calculate the density of states of a spin system. Starting with an initial random state, they obtain the time evolution of the state. Later they take the inner product of the evolved state with the initial state. How does the inner product formation fit into the quantum computation model? Is it a measurement on the initial and the evolved states?
 
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I have a similar query, wondering whether taking the inner product of two qubits, say phi and psi, <phi|psi> means that the qubits are destroyed afterwards or not. In other words, is it possible to obtain information about their product without being considered as a measurement?
 

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