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Joint measurements of multiple qubits have been shown to open newpossibilities for quantum information processing. Here, we present an approachbased on homodyne detection to realize such measurements in the dispersiveregime of cavity/circuit QED. By changing details of the measurement, thereadout can be tuned from extracting only single-qubit to only multi-qubitproperties. We obtain a reduced stochastic master equation describing thismeasurement and its effect on the qubits. As an example, we present resultsshowing parity measurements of two qubits. In this situation, measurement of aninitially unentangled state can yield with near unit probability a state ofsignificant concurrence.

Tunable joint measurements in the dispersive regime of cavity QED