Fig. 1
From: Studying light-harvesting models with superconducting circuits
Model system for light harvesting and its superconducting circuit realization. a Schematic of three coupled chlorophyll molecules hosting chromophores modeled as three qubits Q1,2,3 (red, blue, and green). The strongly coupled Q1 and Q2 hybridize with coupling strength J12 into a bright state |b〉 (olive cloud) and dark states (dark gray clouds). Q2 is coupled to Q3 with a coupling strength J23 which forms the dark hybridized states |d1〉 and |d2〉. The incident, the re-emitted, and the harvested radiation are indicated by arrows. Pink lines indicate that Q2 is subjected to environmental noise. b False color micrograph of the superconducting circuit. Transmon qubits Q1 and Q2 (red, blue) are capacitively coupled to a transmission line (purple) and Q3 (green) is capacitively coupled to a high-emission-rate resonator (orange). Excitation radiation (Sin) is applied through port 1 of the transmission line. The re-emitted (S2) and extracted radiation (S4) are detected at port 2 and 4, respectively. Low-frequency noise with an engineered spectral density, modeling the environment (Snoise), is applied to Q2 via the flux line at port 5
