Lu, Y and Bengtsson, A and Burnett, JJ and Suri, B and Sathyamoorthy, SR and Nilsson, HR and Scigliuzzo, M and Bylander, J and Johansson, G and Delsing, P (2021) Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source. In: NPJ Quantum Information, 7 (1).
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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 �-pulse excites the qubit, which subsequently rapidly emits a single photon into the transmission line. A cancellation pulse then suppresses the reflected �-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. © 2021, The Author(s).
| Item Type: | Journal Article |
|---|---|
| Publication: | NPJ Quantum Information |
| Publisher: | Nature Research |
| Additional Information: | The copyright for this article belongs to Nature Research. |
| Keywords: | Efficiency; Electric lines; Elementary particle sources; Photons; Quantum efficiency; Qubits; Transmissions, Narrow bands; On demands; Quantum applications; Quantum technologies; Single photons; Single-photon source; Technologies and applications; Transmission-line; Transmon qubit; Tunables, Particle beams |
| Department/Centre: | Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics |
| Date Deposited: | 27 Oct 2021 11:15 |
| Last Modified: | 27 Oct 2021 11:15 |
| URI: | http://eprints.iisc.ac.in/id/eprint/70271 |
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