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Related Concept Videos

Gauss's Law01:07

Gauss's Law

If a closed surface does not have any charge inside where an electric field line can terminate, then the electric field line entering the surface at one point must necessarily exit at some other point of the surface. Therefore, if a closed surface does not have any charges inside the enclosed volume, then the electric flux through the surface is zero. What happens to the electric flux if there are some charges inside the enclosed volume? Gauss's law gives a quantitative answer to this question.
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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The Entropy as a State Function

Consider an arbitrary process that moves between two specific states (A and B) in a cyclic manner. This process is reversible and broken down into smaller parts that each follow a Carnot cycle. A Carnot cycle has two isothermal (constant temperature) processes. During these processes, the ratio of the amount of heat transferred to their respective temperature remains constant. The other two processes in the Carnot cycle are also reversible but adiabatic, which means they occur without any heat...
Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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Gaussian Elimination: Problem Solving01:30

Gaussian Elimination: Problem Solving

Systems of linear equations in several variables are pivotal in modeling complex scenarios involving multiple unknowns and constraints. Such systems are widely used in various fields to represent relationships where several conditions must be simultaneously satisfied. Each variable in the system corresponds to an unknown quantity, while each equation imposes a linear constraint, leading to a structured approach for analyzing and solving real-world problems.A system of three equations with three...
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Equilibrium Conditions for a Particle

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Updated: Jun 8, 2026

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

Controllable gaussian-qubit interface for extremal quantum state engineering.

Gerardo Adesso1, Steve Campbell, Fabrizio Illuminati

  • 1School of Mathematical Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

We demonstrate precise control over quantum entanglement between remote qubits using light fields. This method allows engineering of maximally entangled two-qubit states for quantum information processing applications.

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Last Updated: Jun 8, 2026

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

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
  • Quantum Optics
  • Atomic, Molecular & Optical Physics

Background:

  • Quantum entanglement is a key resource for quantum information processing.
  • Controlling and engineering entangled states is crucial for developing quantum technologies.
  • Bilinear interactions offer a pathway for mediating entanglement between quantum systems.

Purpose of the Study:

  • To investigate state engineering via bilinear interactions between remote qubits and two-mode Gaussian light fields.
  • To explore the full range of attainable two-qubit states in the entanglement-versus-global-purity plane.
  • To establish a method for generating maximally entangled two-qubit states using controllable Gaussian states.

Main Methods:

  • Utilizing bilinear interactions to couple two remote qubits with two-mode Gaussian light fields.
  • Analyzing the entanglement properties of the resulting two-qubit states.
  • Characterizing two-mode Gaussian states by their entanglement and entropy measures.

Main Results:

  • The engineered two-qubit states cover the entire physically accessible region in the entanglement-global purity plane.
  • Maximal entanglement in two-mode Gaussian states directly leads to maximally entangled two-qubit states.
  • A concise set of parameters for extremally entangled Gaussian states enables precise engineering of two-qubit states.

Conclusions:

  • State engineering of remote qubits is achievable through interactions with Gaussian light fields.
  • The proposed method provides a direct route to maximally entangled two-qubit states.
  • These findings are relevant for realistic matter-light systems and quantum information applications.