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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...
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Related Experiment Video

Updated: Jun 26, 2026

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
05:30

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

Experimental quantum computing without entanglement.

B P Lanyon1, M Barbieri, M P Almeida

  • 1Department of Physics and Centre for Quantum Computer Technology, University of Queensland, Brisbane 4072, Australia. lanyon@physics.uq.edu.au

Physical Review Letters
|December 31, 2008
PubMed
Summary
This summary is machine-generated.

Deterministic quantum computation with one pure qubit (DQC1) uses mixed states, not entanglement, for efficiency. Experiments show quantum discord, not entanglement, drives DQC1 power, offering a resource for quantum technologies.

Related Experiment Videos

Last Updated: Jun 26, 2026

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
05:30

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

Area of Science:

  • Quantum Information Science
  • Quantum Computation
  • Quantum Optics

Background:

  • Deterministic quantum computation with one pure qubit (DQC1) is an efficient computational model.
  • DQC1 utilizes highly mixed quantum states, diverging from pure-state models.
  • The source of DQC1's computational advantage is debated, with entanglement and quantum discord as candidates.

Purpose of the Study:

  • To experimentally investigate the correlations generated in the DQC1 model.
  • To determine if entanglement or quantum discord is responsible for DQC1's computational power.
  • To explore the potential of mixed quantum states in quantum information technologies.

Main Methods:

  • Implementation of the DQC1 model using an all-optical architecture.
  • Experimental observation and characterization of quantum correlations.
  • Analysis of entanglement and quantum discord in the generated states.

Main Results:

  • No entanglement was detected in the implemented DQC1 states.
  • Significant amounts of quantum discord were observed.
  • Three specific cases were identified where classical simulation is efficient, correlating with low quantum discord.

Conclusions:

  • Quantum discord, rather than entanglement, appears to be the key resource for DQC1.
  • Highly mixed, separable quantum states can possess nonclassical correlations.
  • These quantum correlations represent a valuable resource for advancing quantum information technologies.