Related Experiment Video
Updated: Feb 17, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Spectroscopic signatures of localization with interacting photons in superconducting qubits
P Roushan1, C Neill2, J Tangpanitanon3
1Google Inc., Santa Barbara, CA, USA. pedramr@google.com dimitris.angelakis@gmail.com.
Abstract:
Quantized eigenenergies and their associated wave functions provide extensive information for predicting the physics of quantum many-body systems. Using a chain of nine superconducting qubits, we implement a technique for resolving the energy levels of interacting photons. We benchmark this method by capturing the main features of the intricate energy spectrum predicted for two-dimensional electrons in a magnetic field-the Hofstadter butterfly. We introduce disorder to study the statistics of the energy levels of the system as it undergoes the transition from a thermalized to a localized phase. Our work introduces a many-body spectroscopy technique to study quantum phases of matter.
Related Concept Videos
IR Absorption Frequency: Delocalization
In IR...
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
Molecular Spectroscopy: Absorption and Emission
NMR Spectroscopy: Spin–Spin Coupling
Interaction of EM Radiation with Matter: Spectroscopy
UV–Vis Spectroscopy: Molecular Electronic Transitions

