Microwave photon generation in a doubly tunable superconducting resonator

I. M. Svensson, M. Pierre, M. Simoen, W. Wustmann, P. Krantz, A. Bengtsson, G. Johansson, J. Bylander, V. Shumeiko, P. Delsing

Research output: Contribution to journalConference articlepeer-review


We have created a doubly tunable resonator, with the intention to simulate relativistic motion of the resonator boundaries in real space. Our device is a superconducting coplanar-waveguide microwave resonator, with fundamental resonant frequency ω 1 /(2π) ∼ 5 GHz. Both of its ends are terminated to ground via dc-SQUIDs, which serve as magnetic-flux-controlled inductances. Applying a flux to either SQUID allows the tuning of ω 1 /(2π) by approximately 700 MHz. Using two separate on-chip magnetic-flux lines, we modulate the SQUIDs with two tones of equal frequency, close to 2ω 1. We observe photon generation, at ω 1, above a certain pump amplitude threshold. By varying the relative phase of the two pumps we are able to control this threshold, in good agreement with a theoretical model. At the same time, some of our observations deviate from the theoretical predictions, which we attribute to parasitic couplings resulting in current driving of the SQUIDs.

Original languageEnglish
Article number012146
JournalJournal of Physics: Conference Series
Issue number1
StatePublished - 19 Apr 2018
Externally publishedYes
Event28th International Conference on Low Temperature Physics, LT 2018 - Gothenburg, Sweden
Duration: 9 Aug 201716 Aug 2017


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