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Related Concept Videos

The de Broglie Wavelength02:32

The de Broglie Wavelength

In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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...
Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Related Experiment Video

Updated: Jun 23, 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

Characterization of decoherence processes in quantum computation.

J Poyatos, I Cirac, P Zoller

    Optics Express
    |April 22, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Quantum tomography fully characterizes open quantum systems, even in imperfect ion trap quantum computers. This research analyzes a key two-bit quantum gate

    Related Experiment Videos

    Last Updated: Jun 23, 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
    • Atomic, Molecular, and Optical Physics

    Background:

    • Open quantum systems are challenging to characterize due to environmental interactions.
    • Ion trap quantum computers face non-ideal operating conditions from environmental coupling.

    Purpose of the Study:

    • To demonstrate full characterization of open quantum system dynamics using quantum tomography.
    • To apply quantum tomography to an ion trap quantum computer.
    • To investigate the performance of a two-bit quantum gate under realistic conditions.

    Main Methods:

    • Utilized quantum tomography techniques for system dynamics characterization.
    • Applied methods to a multi-ion system within an ion trap setup.
    • Varied parameters related to ion-laser field interactions.

    Main Results:

    • Successfully characterized the dynamics of the open quantum system.
    • Evaluated the performance of a fundamental two-bit quantum gate.
    • Identified dependencies of gate performance on environmental interaction parameters.

    Conclusions:

    • Quantum tomography is effective for fully characterizing open quantum systems.
    • The study provides insights into the performance of quantum gates in realistic ion trap systems.
    • Understanding environmental interactions is crucial for improving quantum computation fidelity.