- #1
poonintoon
- 17
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Hi I am looking at Quantum Computation by Neilsen and Chuang at the CHSH inequality.
Looking at the spin singlet state they make measurements of for example the observable Z1
and Z2-X1 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).
Looking at the spin singlet state they make measurements of for example the observable Z1
and Z2-X1 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).