title: Demonstration of an ac Josephson junction laser.
abstract: Superconducting electronic devices have reemerged as contenders for both classical and quantum computing due to their fast operation speeds, low dissipation, and long coherence times. An ultimate demonstration of coherence is lasing. We use one of the fundamental aspects of superconductivity, the ac Josephson effect, to demonstrate a laser made from a Josephson junction strongly coupled to a multimode superconducting cavity. A dc voltage bias applied across the junction provides a source of microwave photons, and the circuit's nonlinearity allows for efficient down-conversion of higher-order Josephson frequencies to the cavity's fundamental mode. The simple fabrication and operation allows for easy integration with a range of quantum devices, allowing for efficient on-chip generation of coherent microwave photons at low temperatures.
authors.affiliation: QuTech, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: M C
authors.identifier: 0000-0002-7780-1549
authors.initials: MC
authors.lastname: Cassidy
authors.affiliation: QuTech, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: A
authors.identifier: 0000-0002-7821-5082
authors.initials: A
authors.lastname: Bruno
authors.affiliation: Kavli Institute for Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: S
authors.identifier: 0000-0003-4467-9361
authors.initials: S
authors.lastname: Rubbert
authors.affiliation: Kavli Institute for Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: M
authors.identifier: 0000-0002-2924-8451
authors.initials: M
authors.lastname: Irfan
authors.affiliation: QuTech, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: J
authors.identifier: 0000-0001-6476-0736
authors.initials: J
authors.lastname: Kammhuber
authors.affiliation: QuTech, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands.|Kavli Institute for Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: R N
authors.identifier: 0000-0003-4118-5120
authors.initials: RN
authors.lastname: Schouten
authors.affiliation: Kavli Institute for Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: A R
authors.identifier: 0000-0001-8031-1340
authors.initials: AR
authors.lastname: Akhmerov
authors.affiliation: QuTech, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands. l.p.kouwenhoven@tudelft.nl.|Kavli Institute for Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands.
authors.forename: L P
authors.identifier: 0000-0002-7046-8181
authors.initials: LP
authors.lastname: Kouwenhoven