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Quantum efficiency,...
Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source
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- Lu, Yong, 1989 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Bengtsson, Andreas, 1991 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Burnett, Jonathan, 1987 (author)
- National Physical Laboratory (NPL),Chalmers tekniska högskola,Chalmers University of Technology
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- Suri, Baladitya, 1984 (author)
- Indian Institute of Science,Chalmers tekniska högskola,Chalmers University of Technology
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- Sathyamoorthy, Sankar Raman, 1984 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Renberg Nilsson, Hampus, 1993 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Scigliuzzo, Marco, 1987 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Bylander, Jonas, 1978 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Johansson, Göran, 1971 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Delsing, Per, 1959 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2021-09-23
- 2021
- English.
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In: npj Quantum Information. - : Springer Science and Business Media LLC. - 2056-6387. ; 7:1
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Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
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Lu, Yong, 1989
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Bengtsson, Andre ...
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Burnett, Jonatha ...
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Suri, Baladitya, ...
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Sathyamoorthy, S ...
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Renberg Nilsson, ...
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show more...
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Scigliuzzo, Marc ...
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Bylander, Jonas, ...
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Johansson, Göran ...
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Delsing, Per, 19 ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Electrical Engin ...
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and Other Electrical ...
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npj Quantum Info ...
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Chalmers University of Technology