Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.050507
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Funding
- Dutch Organization for Fundamental Research on Matter (FOM)
- the Netherlands Organization for Scientific Research (NWO) [680-47-508]
- EU FP7 project SOLID
- DARPA QuEST program
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We demonstrate initialization by joint measurement of two transmon qubits in 3D circuit quantum electrodynamics. Homodyne detection of cavity transmission is enhanced by Josephson parametric amplification to discriminate the two-qubit ground state from single-qubit excitations nondestructively and with 98.1% fidelity. Measurement and postselection of a steady-state mixture with 4.7% residual excitation per qubit achieve 98.8% fidelity to the ground state, thus outperforming passive initialization.
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