On-demand single-microwave-photon source in a superconducting circuit with wideband frequency tunability Hawaldar, Samarth ; https://orcid.org/0000-0002-1965-4309 Khaire, Siddhi Satish Delsing, Per Suri, Baladitya ddc:539 In this article, we propose a method for generating single microwave photons in superconducting circuits. We theoretically show that pure single microwave photons can be generated on demand and tuned over a large frequency band by making use of Landau-Zener transitions under a rapid sweep of a control parameter. We devise a protocol that enables fast control of the frequency of the emitted photon over two octaves, without requiring extensive calibration. Additionally, we make theoretical estimates of the generation efficiency, tunability, purity, and linewidth of the photons emitted using this method for both charge- and flux-qubit-based architectures. We also provide estimates of the optimal device parameters required for these architectures to realize the device. American Physical Society 2025 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_2df8fbb1 https://research-explorer.ista.ac.at/record/19617 https://research-explorer.ista.ac.at/download/19617/19620 Hawaldar S, Khaire SS, Delsing P, Suri B. On-demand single-microwave-photon source in a superconducting circuit with wideband frequency tunability. <i>Physical Review Applied</i>. 2025;23(4). doi:<a href="https://doi.org/10.1103/physrevapplied.23.044042">10.1103/physrevapplied.23.044042</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1103/physrevapplied.23.044042 info:eu-repo/semantics/altIdentifier/issn/2331-7019 info:eu-repo/semantics/altIdentifier/wos/001490745300002 info:eu-repo/semantics/openAccess