Hi I am looking at Quantum Computation by Neilsen and Chuang at the CHSH inequality.(adsbygoogle = window.adsbygoogle || []).push({});

Looking at the spin singlet state they make measurements of for example the observable Z_{1}

and Z_{2}-X_{1}and then find the expectation value of the product.

I am slightly confused here because

a) Z and X are gates does it just mean to find the average of the system after these have acted on the system?

b)Secondly can I find the average of a two qubit system without using the density operator. If I need to use the density operator is there a simple way?

Thanks

(Sorry its hard to make it clear without waffling on for ages but since its a popular book hopefully someone will understand me).

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# Finding averages of observables of Bell states

Can you offer guidance or do you also need help?

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