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Related Concept Videos

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...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...

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Related Experiment Video

Updated: Jul 15, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Generalised quantum computational spectroscopy on a quantum chip.

Chonghao Zhai1, Jinzhao Sun2,3, Jieshan Huang4

  • 1State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing, China. chonghao.zhai@pku.edu.cn.

Nature Communications
|July 13, 2026
PubMed
Summary

This study introduces a generalized quantum computational spectroscopy method. It reconstructs quantum autocorrelation functions to analyze diverse quantum systems, overcoming limitations of previous quantum algorithms.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Related Experiment Videos

Last Updated: Jul 15, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Area of Science:

  • Quantum physics and computational spectroscopy.
  • Development of advanced quantum algorithms for spectral analysis.

Background:

  • Computational spectroscopy is crucial for scientific discovery but faces challenges with complex quantum systems.
  • Existing quantum algorithms are limited to static and closed quantum systems, hindering broader applications.

Purpose of the Study:

  • To present a generalized quantum computational spectroscopy method applicable to various quantum systems.
  • To overcome limitations of current quantum algorithms in analyzing dynamic and open quantum systems.

Main Methods:

  • Reconstruction of the quantum autocorrelation function using an ancilla-assisted Hadamard test quantum circuit.
  • Experimental validation on a silicon-photonic quantum processing chip with arbitrary controlled quantum dynamics.
  • Implementation of a classical noise-mitigation strategy for robust spectral analysis.

Main Results:

  • Demonstration of a versatile quantum computational spectroscopy applicable to closed, open, and time-dependent driven quantum systems.
  • Successful spectroscopic computations revealing phenomena like parity-time symmetry breaking and topological holonomy.
  • Establishment of a noise-robust methodology for quantum spectral analysis.

Conclusions:

  • The developed method significantly advances quantum computational spectroscopy by enabling analysis of complex, dynamic quantum systems.
  • This approach opens new avenues for exploring quantum phenomena inaccessible through conventional methods.
  • The work provides a robust framework for quantum spectral analysis with broad applicability in physics, chemistry, and materials science.