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