Berlin 2024 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 23: Focus Session: Nanomechanical Systems for Classical and Quantum Sensing I (joint session TT/DY/HL/QI)
HL 23.1: Vortrag
Dienstag, 19. März 2024, 11:45–12:00, H 3007
Josephson Optomechanics — •Surangana Sengupta1, Bjoern Kubala1,2, Joachim Ankerhold1, and Ciprian Padurariu1 — 1ICQ and IQST, Ulm University, Germany — 2DLR-QT, German Aerospace Center, Ulm, Germany
In recent years, optomechanical cooling using microwave radiation has been realized in various superconducting circuits with a microwave cavity comprising a mechanical element. Circuits provide an opportunity to engineer nonlinear cavities, by using Josephson junctions, thereby generating quantum states of light for optomechanics experiments.
Here, we will theoretically describe an optomechanical setup where the cavity is realized by an LC circuit driven by a dc-biased Josephson junction. By engineering the nonlinearity, such a cavity becomes an effective N-level system, with N=2,3,..., where the access to Fock states N and above is blocked. Consequently, the cavity emission spectrum shows Mollow-type side peaks, analogous to an optical cavity interacting with an atom. We show that at these Mollow side peaks, the system exhibits a new, nonlinear type of optomechanical cooling. We calculate the cooling rate using the spectral density of noise due to the radiation pressure [1] and highlight how its unusual features compared to conventional optomechanics, can be explained in a dressed state picture.
[1] F. Marquardt et.al., Phys. Rev. Lett. 99 (2007) 093902
Keywords: optomechanical cooling; superconducting circuits; Mollow triplet; nonlinear