Mechanical Purcell Filters for Microwave Quantum Machines
arXiv:1905.08403 · doi:10.1063/1.5111151
Abstract
In circuit quantum electrodynamics, measuring the state of a superconducting qubit introduces a loss channel which can enhance spontaneous emission through the Purcell effect, thus decreasing qubit lifetime. This decay can be mitigated by performing the measurement through a Purcell filter which forbids signal propagation at the qubit transition frequency. If the filter is also well-matched at the readout cavity frequency, it will protect the qubit from decoherence channels without sacrificing measurement speed. We propose and analyze design for a mechanical Purcell filter, which we also fabricate and characterize at room temperature. The filter is comprised of an array of nanomechanical resonators in thin-film lithium niobate, connected in a ladder topology, with series and parallel resonances arranged to produce a bandpass response. The modest footprint, steep band edges, and absence of cross-talk in these filters make them a novel and appealing alternative to analogous electromagnetic versions currently used in microwave quantum machines.
arXiv comment5 pages, 5 figures
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Cited by in corpus (8)
- A scalable superconducting quantum simulator with long-range connectivity based on a photonic bandgap metamaterial
- Gigahertz phononic integrated circuits on thin-film lithium niobate on sapphire
- Piezoelectric transduction of a wavelength-scale mechanical waveguide
- Broadband Bandpass Purcell Filter for Circuit Quantum Electrodynamics
- Multi-Purpose Architecture for Fast Reset and Protective Readout of Superconducting Qubits
- Characterization of Broadband Purcell Filters with Compact Footprint for Fast Multiplexed Superconducting Qubit Readout
- Interferometric Purcell suppression of spontaneous emission in a superconducting qubit
- Gigahertz-frequency Lamb wave resonator cavities on suspended lithium niobate for quantum acoustics