Two-qubit state tomography using a joint dispersive readout

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 t...

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Bibliographic Details
Published in:Physical review letters 2009-05, Vol.102 (20), p.200402-200402, Article 200402
Main Authors: Filipp, S, Maurer, P, Leek, P J, Baur, M, Bianchetti, R, Fink, J M, Göppl, M, Steffen, L, Gambetta, J M, Blais, A, Wallraff, A
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.102.200402