Strategies and trade-offs for controllability and memory time of ultra-high-quality microwave cavities in circuit QED
arxiv(2024)
摘要
Three-dimensional microwave cavity resonators have been shown to reach
lifetimes of the order of a second by maximizing the cavity volume relative to
its surface, using better materials, and improving surface treatments. Such
cavities represent an ideal platform for quantum computing with bosonic qubits,
but their efficient control remains an outstanding problem since the large mode
volume results in inefficient coupling to nonlinear elements used for their
control. Moreover, this coupling induces additional cavity decay via the
inverse Purcell effect which can easily destroy the advantage of a long
intrinsic lifetime. Here, we discuss conditions on, and protocols for,
efficient utilization of these ultra-high-quality microwave cavities as
memories for conventional superconducting qubits. We show that, surprisingly,
efficient write and read operations with ultra-high-quality cavities does not
require similar quality factors for the qubits and other nonlinear elements
used to control them. Through a combination of analytical and numerical
calculations, we demonstrate that efficient coupling to cavities with
second-scale lifetime is possible with state-of-the-art transmon and SNAIL
devices and outline a route towards controlling cavities with even higher
quality factors. Our work explores a potentially viable roadmap towards using
ultra-high-quality microwave cavity resonators for storing and processing
information encoded in bosonic qubits.
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