Publications associated with Superconducting Quantum Devices

Two-Qubit State Tomography using a Joint Dispersive Read-Out

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S Filipp, P Maurer, PJ Leek, M Baur, R Bianchetti, JM Fink, M Göppl, L Steffen, JM Gambetta, A Blais, A Wallraff

Quantum state tomography is an important tool in quantum information science for complete characterization of multi-qubit states and their correlations. Here we report a method to perform a joint simultaneous read-out of two superconducting qubits dispersively coupled to the same mode of a microwave transmission line resonator. The non-linear 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 read-out of individual qubits. We employ standard tomographic techniques to reconstruct the density matrix of two-qubit quantum states.

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