Microwave photon generation in a doubly tunable superconducting resonator

Abstract

We have developed and tested a doubly tunable resonator, with the intention to simulate fast motion of the resonator boundaries in real space. Our device is a superconducting coplanar-waveguide half-wavelength microwave resonator, with fundamental resonant frequency ~5 GHz. Both of its ends are terminated by dc-SQUIDs, which serve as magnetic-flux-controlled inductances. Applying a flux to either SQUID allows tuning of the resonant frequency by approximately 700 MHz. By using two separate on-chip magnetic-flux lines, we modulate the SQUIDs with two tones of equal frequency, close to twice that of the resonator's fundamental mode. We observe photon generation, at the fundamental frequency, above a certain pump amplitude threshold. By varying the relative phase of the two pumps we are able to control the photon generation threshold, in good agreement with a theoretical model for the modulation of the boundary conditions. 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.

arXiv comment7 pages, 4 figures

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Cited by in corpus (9)

• A Quantum Engineer's Guide to Superconducting Qubits
• Dynamical Casimir effect in a double tunable superconducting circuit
• Enhancement of particle creation in nonlinear resonant cavities
• Frequency Fluctuations in Tunable and Nonlinear Microwave Cavities
• A Nonlinear Charge- and Flux-Tunable Cavity Derived from an Embedded Cooper Pair Transistor
• Dynamical Casimir effect via modulated Kerr or higher nonlinearities
• Dynamical Casimir effect with screened scalar fields
• Adiabatic Shortcuts Completion in Quantum Field Theory: Annihilation of Created Particles
• Generation of photons from vacuum in cavity via time-modulation of a qubit invisible to the field