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Initialization by measurement of a two-qubit superconducting circuit
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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 non-destructively 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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Quantum bits with Josephson junctions
A review chapter explaining how Josephson junctions are used to build quantum bits, their circuits, and their applications to quantum computing and quantum optics.
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