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- W3202397858 abstract "Abstract We demonstrate an on-demand source of microwave single photons with 71–99% intrinsic quantum efficiency. The source is narrowband (300 kHz) and tuneable over a 600 MHz range around 5.2 GHz. Such a device is an important element in numerous quantum technologies and applications. The device consists of a superconducting transmon qubit coupled to the open end of a transmission line. A π -pulse excites the qubit, which subsequently rapidly emits a single photon into the transmission line. A cancellation pulse then suppresses the reflected π -pulse by 33.5 dB, resulting in 0.005 photons leaking into the photon emission channel. We verify strong antibunching of the emitted photon field and determine its Wigner function. Non-radiative decay and 1/ f flux noise both affect the quantum efficiency. We also study the device stability over time and identify uncorrelated discrete jumps of the pure dephasing rate at different qubit frequencies on a time scale of hours, which we attribute to independent two-level system defects in the device dielectrics, dispersively coupled to the qubit. Our single-photon source with only one input port is more compact and scalable compared to standard implementations." @default.
- W3202397858 created "2021-10-11" @default.
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- W3202397858 date "2021-09-23" @default.
- W3202397858 modified "2023-10-16" @default.
- W3202397858 title "Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source" @default.
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- W3202397858 doi "https://doi.org/10.1038/s41534-021-00480-5" @default.
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