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Related Concept Videos

Phase Transitions02:31

Phase Transitions

Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
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Related Experiment Video

Updated: Jun 29, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Probing mixed-state phases on a quantum computer via Renyi correlators and variational decoding.

Yuxuan Zhang1,2,3,4, Timothy H Hsieh5, Yong Baek Kim6

  • 1Department of Physics, University of Toronto, Toronto, ON, Canada. yuxuan.zhang@epfl.ch.

Nature Communications
|June 27, 2026
PubMed
Summary
This summary is machine-generated.

Researchers experimentally characterized mixed-state phases in open quantum systems using a quantum computer. They utilized Renyi correlators and quantum error-correcting codes to distinguish distinct phases under environmental noise.

Related Experiment Videos

Last Updated: Jun 29, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Area of Science:

  • Quantum Information Science
  • Condensed Matter Physics
  • Quantum Computing

Background:

  • Open quantum systems exhibit nontrivial phases of matter influenced by environmental noise.
  • Characterizing these mixed-state phases is crucial for understanding complex quantum phenomena.

Purpose of the Study:

  • To experimentally probe and characterize mixed-state phases in open quantum systems.
  • To utilize Renyi correlators and quantum error-correcting code performance as diagnostic tools.
  • To investigate the critical transverse field Ising model under dephasing noise.

Main Methods:

  • Utilized Quantinuum's H1 quantum computer for experimental simulations.
  • Employed shadow tomography to measure Renyi correlators.
  • Investigated decoding fidelity of associated quantum error-correcting codes via variational quantum circuits.

Main Results:

  • Successfully distinguished two distinct mixed-state phases by measuring Renyi correlator decay rates.
  • Demonstrated that a shallow quantum circuit (depth-3) can distinguish phases up to system size L=24.
  • Observed experimental distinction of phases up to L=8 with a depth-1 decoder.

Conclusions:

  • This work serves as a proof of concept for simulating and characterizing mixed-state phases.
  • Highlights the potential of quantum computers for exploring complex quantum matter.
  • Establishes Renyi correlators and error-correcting code performance as viable measures for phase characterization.