Multiphoton Generator on a Chip | Latest Articel published in Phys Rev and featured in Physics

A device for producing up to six photons in a single event could open new doors to quantum technologies.

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Article in Phys. Rev., April 8, 2022

Gerbold Ménard of the University of Paris-Saclay and IQST-Director Joachim Ankerhold, along with their colleagues have devised a chip-sized multiphoton generator by using a superconducting circuit. The circuit consists of a device called a Josephson junction coupled to a standard inductance-coil  resonator, in which the current automatically oscillates at a particular frequency. A Josephson junction consists of two superconducting materials separated by a thin slab of insulating material. If a voltage is applied across the Josephson junction, a Cooper pair can quantum-mechanically tunnel across the insulating gap, acquiring an amount of energy determined by the applied voltage. The pair can then shed its energy into the resonator circuit, which radiates the energy like an antenna in the form of photons.

The team’s creation of a state with up to six photons is “an important achievement in their work,” says quantum physicist Jukka Pekola of Aalto University in Finland. Former experiments using superconducting circuits  to make such multiplets were much more complicated, requiring a lot of hardware and multistep processes. 

The articel is featured in Physics

View the article published in Phys. Rev. on April 8, 2022:
G. C. Ménard et al., “Emission of photon multiplets by a dc-biased superconducting circuit,” Physical Review X 12, 021006 (2022)