@article{1768, abstract = {Quantum state tomography is an important tool in quantum information science for complete characterization of multiqubit states and their correlations. Here we report a method to perform a joint simultaneous readout of two superconducting qubits dispersively coupled to the same mode of a microwave transmission line resonator. The nonlinear dependence of the resonator transmission on the qubit state dependent cavity frequency allows us to extract the full two-qubit correlations without the need for single-shot readout of individual qubits. We employ standard tomographic techniques to reconstruct the density matrix of two-qubit quantum states.}, author = {Filipp, Stefan and Maurer, Patrick and Leek, Peter J and Baur, Matthias P and Bianchetti, R and Johannes Fink and Göppl, M and Steffen, L. Kraig and Gambetta, Jay M and Blais, Alexandre and Wallraff, Andreas}, journal = {Physical Review Letters}, number = {20}, publisher = {American Physical Society}, title = {{Two-qubit state tomography using a joint dispersive readout}}, doi = {10.1103/PhysRevLett.102.200402}, volume = {102}, year = {2009}, }