Tunable joint measurements in the dispersive regime of cavity QED

Details Tunable joint measurements in the dispersive regime of cavity QED Tunable joint measurements in the dispersive regime of cavity QED

2009-11-27

arxiv.org/abs/0911.5322v2

Phys. Rev. A 81, 040301(R) (2010)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevA.81.040301

Joint measurements of multiple qubits have been shown to open new possibilities for quantum information processing. Here, we present an approach based on homodyne detection to realize such measurements in the dispersive regime of cavity/circuit QED. By changing details of the measurement, the readout can be tuned from extracting only single-qubit to only multi-qubit properties. We obtain a reduced stochastic master equation describing this measurement and its effect on the qubits. As an example, we present results showing parity measurements of two qubits. In this situation, measurement of an initially unentangled state can yield with near unit probability a state of significant concurrence.

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