Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source

Lu, Yong,1989Chalmers tekniska högskola,Chalmers University of Technology (författare)

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.

Bengtsson, Andreas,1991Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)andbe (författare)
Burnett, Jonathan,1987National Physical Laboratory (NPL),Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)burnett (författare)
Suri, Baladitya,1984Chalmers tekniska högskola,Chalmers University of Technology,Indian Institute of Science(Swepub:cth)surib (författare)
Sathyamoorthy, Sankar Raman,1984Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)sankarr (författare)
Renberg Nilsson, Hampus,1993Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)vidarh (författare)
Scigliuzzo, Marco,1987Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)scmarco (författare)
Bylander, Jonas,1978Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)bylander (författare)
Johansson, Göran,1971Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)gojo71 (författare)
Delsing, Per,1959Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)delsing (författare)
Chalmers tekniska högskolaNational Physical Laboratory (NPL) (creator_code:org_t)

Ingår i:npj Quantum Information: Springer Science and Business Media LLC7:12056-6387

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