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In most experiments on flux qubits,the "measurement" is performed by couplingthe system to a dc SQUID and recording the distribution of switching currentsfor the latter;this measurement protocol is very far from the classic vonNeumann ("projective") scheme,in that very little information is obtained froma single run,rather one has to repeat the experiment tens of thosands of timesto extract anything useful.Here, concentrating on the equlibrium behavior ofthe flux qubit,we carry out an analytic calculation of the dc-SQUID switchingcurrent distribution as a function of external bias flux on the qubit,andcompare our predictions with the data from experiments conducted at Delft andNTT.

The escape physics of single shot measurement of flux qubit with dcSQUID