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Molecular Orbital Theory I

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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.

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Updated: Dec 21, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Quantum entanglement between an atom and a molecule.

Yiheng Lin^1,2,3,4, David R Leibrandt^5,6, Dietrich Leibfried^5,6

¹CAS Key Laboratory of Microscale Magnetic Resonance, Department of Modern Physics, University of Science and Technology of China, Hefei, China. yiheng@ustc.edu.cn.

|May 21, 2020

Summary

This summary is machine-generated.

Researchers demonstrated entanglement between a molecular ion and an atomic ion, showcasing how molecules can bridge different quantum bit frequencies for hybrid quantum systems.

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Last Updated: Dec 21, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Area of Science:

Quantum Information Science
Molecular Quantum Computing
Hybrid Quantum Systems

Background:

Conventional processors convert information between physical carriers.
Quantum information processing may require transduction between different quantum bit (qubit) frequencies.
Molecules offer potential for transducing quantum information across diverse qubit frequencies.

Purpose of the Study:

To demonstrate entanglement between a molecular ion and an atomic ion.
To explore the use of molecules for quantum information transduction.
To enable hybrid quantum systems by bridging different qubit frequencies.

Main Methods:

Utilized quantum logic spectroscopy techniques for molecular ion control.
Demonstrated entanglement between 40CaH+ molecular ion and 40Ca+ atomic ion.
Leveraged Coulomb coupled motion for entangling manipulations.

Main Results:

Achieved entanglement between rotational states of a molecular ion and internal states of an atomic ion.
Showcased molecular qubit frequencies at 13.4 kHz and 855 GHz.
Demonstrated transduction of quantum information between qubits of different frequencies.

Conclusions:

Molecules can effectively transduce quantum information across varying qubit frequencies.
This method enables the development of versatile hybrid quantum systems.
The demonstrated quantum control and measurement of molecules has broad applications in quantum science and physics.