Year: 2022
Type: article
Abstract: We describe a qubit linearly coupled to a heat bath, either directly or via a cavity.The main focus of the paper is on calorimetric detection in a realistic circuit, specifically a solid-state qubit coupled to a resistor as an absorber.The bath in the model is formed of oscillators initially in the ground state with a distribution of energies and coupling strengths.A direct numerical solution of the Schrödinger equation for the full system including up to 10 6 oscillators in the bath verifies the expected decay process.We address quantitatively the question of separation of the qubit and bath by adding a cavity in between which by detuning allows one to adjust the decay rate into a convenient regime for detection purposes.Most importantly, we propose splitting a quantum to two uncoupled baths and performing a cross-correlation measurement of their temperatures.This technique enhances significantly the signal-to-noise ratio of the calorimeter.
Source: Physical Review X
Authors: Jukka P. Pekola, Bayan Karimi
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,200
Awards: QUantum Electronics Science and TECHnology training, G185954890, PREVention of diabetes through lifestyle Intervention and population studies in Europe and around the World, Superconducting quantum heat engines and refrigerators, G2490340067, G3827491126, G4196313753, G4305478129, G434337789, G6509110417, G8800036604, QUantum Electronics Science and TECHnology training, G917894030
OpenAlex ID: W4210845233