Filipp, Stefan; Maurer, Patrick; Leek, Peter J; Baur, Matthias P; Bianchetti, R; Fink, Johannes MIST Austria ; Göppl, M; Steffen, L. Kraig; Gambetta, Jay M; Blais, Alexandre; Wallraff, Andreas
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.
Physical Review Letters
This work was supported by Swiss National Science Foundation (SNF) and ETH Zurich. P. J. L. was supported by the EC with a MC-EIF, J. M. G. by CIFAR, MRI, MITACS, and NSERC, and A. B. by NSERC and CIFAR
Filipp S, Maurer P, Leek P, et al. Two-qubit state tomography using a joint dispersive readout. Physical Review Letters. 2009;102(20). doi:10.1103/PhysRevLett.102.200402
Filipp, S., Maurer, P., Leek, P., Baur, M., Bianchetti, R., Fink, J. M., … Wallraff, A. (2009). Two-qubit state tomography using a joint dispersive readout. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.102.200402
Filipp, Stefan, Patrick Maurer, Peter Leek, Matthias Baur, R Bianchetti, Johannes M Fink, M Göppl, et al. “Two-Qubit State Tomography Using a Joint Dispersive Readout.” Physical Review Letters. American Physical Society, 2009. https://doi.org/10.1103/PhysRevLett.102.200402.
S. Filipp et al., “Two-qubit state tomography using a joint dispersive readout,” Physical Review Letters, vol. 102, no. 20. American Physical Society, 2009.
Filipp S, Maurer P, Leek P, Baur M, Bianchetti R, Fink JM, Göppl M, Steffen L, Gambetta J, Blais A, Wallraff A. 2009. Two-qubit state tomography using a joint dispersive readout. Physical Review Letters. 102(20).
Filipp, Stefan, et al. “Two-Qubit State Tomography Using a Joint Dispersive Readout.” Physical Review Letters, vol. 102, no. 20, American Physical Society, 2009, doi:10.1103/PhysRevLett.102.200402.