Hi,
When you meadure only the first qubit this means you must project the state with P_0=
|0><0|xId and P_1= |1><1|xId
Where the Id is the identity matrix over other qubits (since they are not measured/touched). The prob of finding 0 is then and similar for 1.
This should help.
NM
When you meadure only the first qubit this means you must project the state with P_0=
|0><0|xId and P_1= |1><1|xId
Where the Id is the identity matrix over other qubits (since they are not measured/touched). The prob of finding 0 is then and similar for 1.
This should help.
NM
