Regensburg 2019 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 4: Focus: Whispering-Gallery-Mode Resonators

KFM 4.1: Invited Talk

Monday, April 1, 2019, 09:30–10:00, H47

Mixing microwave and light: up-conversion and frequency combs — •Harald G. L. Schwefel — Dodd-Walls Centre for Photonic and Quantum Technology, New Zealand — Department of Physics, University of Otago, Dunedin, New Zealand

Dielectric whispering gallery mode resonators are a great tool to entrap electro-magnetic radiation throughout the dielectric’s transparency range [1]. In small resonators this leads to high enough field amplification that nonlinear effects can readily be harnessed. I will discuss hybrid systems which are resonant for both microwave and optical fields and which are based on anisotropic crystalline dielectrics that allow for second order nonlinear effects, such as sum- and difference frequency generation.

In an efficient resonant system and for strong microwave and optical fields, sum- and difference frequency generation can cascade, leading to optical frequency combs [2]. Such combs are useful for telecommunication application such as wavelength division multiplexing and for sensing. For the limit of very weak microwaves and only sum frequency generation, coherent conversion of microwave signals allows the quantum state of individual microwave photons to be transferred into the optical domain [3]. This offers a way to coherently connect superconducting qubits to quantum networks, and allow the rapid scaling of quantum computers.

[1] D. V. Strekalov, et al., J. Opt. 18, 123002 (2016).

[2] A. Rueda, et al., arXiv:1808.10608 [physics] (2018).

[3] A. Rueda, et al., Optica, 3, 597–604 (2016).