Broadband Filters for Abatement of Spontaneous Emission in Circuit Quantum Electrodynamics
arXiv:1508.01743 · doi:10.1063/1.4934867
Abstract
The ability to perform fast, high-fidelity readout of quantum bits (qubits) is essential to the goal of building a quantum computer. However, coupling a fast measurement channel to a superconducting qubit typically also speeds up its relaxation via spontaneous emission. Here we use impedance engineering to design a filter by which photons may easily leave the resonator at the cavity frequency but not at the qubit frequency. We implement this broadband filter in both an on-chip and off-chip configuration.
arXiv comment5 pages, 3 figures
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