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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...
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Related Experiment Video

Updated: Jun 19, 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

Quantum cryptography in free space.

B C Jacobs, J D Franson

    Optics Letters
    |November 3, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Quantum cryptography systems can now operate in free space, overcoming the 30 km limit of fiber optics. This breakthrough enables a potential global quantum network using satellites and ground stations for secure communication.

    Related Experiment Videos

    Last Updated: Jun 19, 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
    • Optics and Photonics
    • Cryptography and Security

    Background:

    • Current quantum cryptography systems are limited to approximately 30 km due to the inability to use amplifiers in optical fibers.
    • Secure communication over longer distances remains a significant challenge in quantum technology.

    Purpose of the Study:

    • To demonstrate a functional quantum cryptography system operating in free space under daylight conditions.
    • To explore the feasibility of a global quantum cryptography network utilizing ground stations and satellites.

    Main Methods:

    • Development and testing of a quantum cryptography system transmitting single photons through free space.
    • Operation and validation of the system under ambient daylight conditions.

    Main Results:

    • Successful demonstration of a fully operational quantum cryptography system in free space during daylight.
    • The system overcomes the distance limitations inherent in fiber-optic quantum communication.

    Conclusions:

    • Free-space quantum cryptography is a viable technology, overcoming previous distance constraints.
    • A global quantum network integrating ground stations and satellites is feasible, paving the way for worldwide secure communication.