article published yes Samarth Hawaldar author 221708e1-1ff6-11ee-9fa6-85146607433e0000-0002-1965-4309 Siddhi Satish Khaire author Per Delsing author Baladitya Suri author GradSch department JoFi department 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. https://research-explorer.ista.ac.at/download/19617/19620/PhysRevApplied.23.044042.pdf application/pdfno American Physical Society2025 eng 2331-7019 00149074530000210.1103/physrevapplied.23.044042 234 Hawaldar, Samarth, Siddhi Satish Khaire, Per Delsing, and Baladitya Suri. “On-Demand Single-Microwave-Photon Source in a Superconducting Circuit with Wideband Frequency Tunability.” <i>Physical Review Applied</i>. American Physical Society, 2025. <a href="https://doi.org/10.1103/physrevapplied.23.044042">https://doi.org/10.1103/physrevapplied.23.044042</a>. Hawaldar S, Khaire SS, Delsing P, Suri B. 2025. On-demand single-microwave-photon source in a superconducting circuit with wideband frequency tunability. Physical Review Applied. 23(4), 044042. Hawaldar, Samarth, et al. “On-Demand Single-Microwave-Photon Source in a Superconducting Circuit with Wideband Frequency Tunability.” <i>Physical Review Applied</i>, vol. 23, no. 4, 044042, American Physical Society, 2025, doi:<a href="https://doi.org/10.1103/physrevapplied.23.044042">10.1103/physrevapplied.23.044042</a>. S. Hawaldar, S. S. Khaire, P. Delsing, and B. Suri, “On-demand single-microwave-photon source in a superconducting circuit with wideband frequency tunability,” <i>Physical Review Applied</i>, vol. 23, no. 4. American Physical Society, 2025. 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> S. Hawaldar, S.S. Khaire, P. Delsing, B. Suri, Physical Review Applied 23 (2025). Hawaldar, S., Khaire, S. S., Delsing, P., &#38; Suri, B. (2025). On-demand single-microwave-photon source in a superconducting circuit with wideband frequency tunability. <i>Physical Review Applied</i>. American Physical Society. <a href="https://doi.org/10.1103/physrevapplied.23.044042">https://doi.org/10.1103/physrevapplied.23.044042</a> 196172025-04-24T06:34:07Z2025-09-30T12:17:33Z