Related Experiment Video
Updated: Aug 14, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Dephasing of a superconducting qubit induced by photon noise
P Bertet1, I Chiorescu, G Burkard
1Quantum Transport Group, Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg, Delft, The Netherlands.
Abstract:
We have studied the dephasing of a superconducting flux qubit coupled to a dc-SQUID based oscillator. By varying the bias conditions of both circuits we were able to tune their effective coupling strength. This allowed us to measure the effect of such a controllable and well-characterized environment on the qubit coherence. We can quantitatively account for our data with a simple model in which thermal fluctuations of the photon number in the oscillator are the limiting factor. In particular, we observe a strong reduction of the dephasing rate whenever the coupling is tuned to zero. At the optimal point we find a large spin-echo decay time of .
Related Concept Videos
¹³C NMR: ¹H–¹³C Decoupling
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Atomic Nuclei: Nuclear Relaxation Processes
Deactivation Processes: Jablonski Diagram
Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
The de Broglie Wavelength
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
