Engineering ultrastrong coupling between Josephson plasmon polaritons and subwavelength microcavity arrays in silicon/van der Waals layered superconductor heterostructure for terahertz hybrid circuit cavity quantum electrodynamics
The realization of the ultrastrong coupling between Josephson plasma waves (JPWs) and terahertz (THz) photons in the subwavelength microcavity array is of interest for manipulating the THz cavity quantum electrodynamics (cQED), ultrahigh-resolution sensing and imaging, and quantum information processing. Here, we describe the engineering of ultrastrong light-matter interactions in a deeply subwavelength microcavity array based on the hybrid silicon and high-temperature superconductor (HTS) Bi2Sr2CaCu2O8+δ (BSCCO) van der Waals (vdW) heterostructure. We perform numerical modeling and analytical calculation to describe Josephson THz cQED and the ultrastrong coupling process between THz radiation and the JPWs in Josephson medium which is naturally present in BSCCO vdW. The resonance frequency of microcavities is swept through the Josephson plasma frequency by altering their width. THz reflection demonstrates the anticrossing behavior of ultrastrong coupling with a normalized Rabi frequency (coupling strength) 2ωR/fc=0.29 for the BSCCO thickness t=200 nm, which increases to the value of 0.87 for t=800 nm. Furthermore, the thermal behavior of coupling strength shows modulation of Rabi splitting 2ωR with temperature. We show that the normalized Rabi splitting 2ωR/fc is independent of the temperature in the BSCCO superconducting regime, while a weak coupling can be observed above the superconducting transition temperature. The proposed chip-scale THz photonic integrated circuit with subwavelength microcavity metamaterial array shall guide the effort in the development of power-efficient coherent THz sources, quantum sensors, ultrasensitive detectors, parametric amplifiers and tunable bolometers based on BSCCO HTS quantum material.
Funding
EPSRC summer school studentship
Royal Society Grant No. RGS\R2\222168
History
School
- Science
Department
- Physics
Published in
Physical Review BVolume
106Issue
24Publisher
American Physical SocietyVersion
- AM (Accepted Manuscript)
Rights holder
© American Physical SocietyPublisher statement
This paper was accepted for publication in the journal Physical Review B and the definitive published version is available at https://doi.org/10.1103/physrevb.106.245140Acceptance date
2022-11-21Publication date
2022-12-23Copyright date
2022ISSN
2469-9950eISSN
2469-9969Publisher version
Language
- en