An example of a two-qubit state is one of the Bell states, for example:(adsbygoogle = window.adsbygoogle || []).push({});

lB> = 1/√2 (l00> + l11>)

In my book it is stated that the Bell states form an orthonormal basis for the set of two qubit states. But what exactly is the general form of a two-qubit state? Is it any vector of the form:

lq> = 1√2 (la>lb> + lc>ld>)

, where la>, lb>, lc> and ld> is any normalized linear combination of l0> and l1>.

If so how can I see that the bell states form an orthonormal basis?

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# Two qubit state

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