Simultaneous State Measurement of Coupled Josephson Phase Qubits.

One of the many challenges of building a scalable quantum computeris singleshot measurement of all the quantum bits (qubits). We have usedsimultaneous single-shot measurement of coupled Josephson phase qubitsto directly probe interaction of the qubits in the time domain. Theconcept of measurement crosstalk is introduced, and we show that itseffects are minimized by careful adjustment of the timing of themeasurements. We observe the antiphase oscillation of the two-qubit [ABSTRACT FROM AUTHOR]