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Bulletin of the American Physical Society

Improving the Coherence Time of Microwave Cavities

Matthew J. Reagor, Hanhee Paik, Luyan Sun, Eric C. Holland, Luigi Frunzio, Robert J. Schoelkopf

Published Feb 28, 2012• 0 citations
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Improving qubit coherence times is fundamental to the development of quantum computing technology. In most experiments in circuit quantum electrodynamics, dephasing induced by residual thermal photons in the readout resonator limits the coherence times of superconducting qubits. The authors design and test a type of microwave cavity attenuator that can be well thermalized to the base stage of a dilution refrigerator. With these cavity attenuators, they reproducibly measure enhanced qubit coherence times and report very low thermal-photon populations in the readout mode. This invention is a useful addition to the toolbox for state-of-the-art quantum circuitry.
Three-dimensional (3D) waveguide cavities with high coherence are used extensively in quantum information technologies. In particular, they provide a well-engineered electromagnetic environment for the readout of superconducting qubits, and thereby improve coherence times. Application of 3D microwave cavities to optomechanical experiments is now of interest. This study describes design guidelines for and demonstrates high cooperativity in an optomechanical system based on a 3D cavity. The high dynamic range and plug-and-play nature of this platform could enable experiments in unexplored regimes of optomechanical interaction.