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Related Concept Videos

Network Function of a Circuit01:25

Network Function of a Circuit

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Frequency response analysis in electrical circuits provides vital insights into a circuit's behavior as the frequency of the input signal changes. The transfer function, a mathematical tool, is instrumental in understanding this behavior. It defines the relationship between phasor output and input and comes in four types: voltage gain, current gain, transfer impedance, and transfer admittance. The critical components of the transfer function are the poles and zeros.
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The Maximum Power Transfer Theorem01:20

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Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
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Maximum Power Transfer01:16

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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The Quantum-Mechanical Model of an Atom02:45

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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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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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Related Experiment Video

Updated: May 22, 2025

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Published on: September 8, 2023

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A 300-km fully-connected quantum secure direct communication network.

Yilin Yang1, Yuanhua Li2, Hao Li1

  • 1State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.

Science Bulletin
|March 14, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a scalable quantum communication network for long-distance, secure data transmission. This quantum secure direct communication (QSDC) network supports multiple users over 300 km, maintaining high fidelity.

Keywords:
Nonlinear opticsQuantum informationQuantum networkQuantum secure direct communication

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Area of Science:

  • Quantum communication networks
  • Quantum information science
  • Secure communication technologies

Background:

  • Current quantum networks face limitations in transmission distance and user scalability.
  • Simultaneously addressing distance and user capacity is a key challenge in quantum network construction.

Purpose of the Study:

  • To propose and demonstrate a long-distance, large-scale, and scalable fully-connected quantum secure direct communication (QSDC) network.
  • To overcome the limitations of existing quantum network technologies for practical applications.

Main Methods:

  • Implementation of a novel double-pumped structure within the quantum network.
  • Strategic introduction of extra noise to enhance network performance and security.
  • Paired communication between four users over a 300 km transmission distance.

Main Results:

  • Successful realization of QSDC over 300 km between four users.
  • Maintained entangled state fidelity above 85% after communication.
  • Demonstrated the viability of the proposed network architecture.

Conclusions:

  • The developed QSDC network effectively addresses long-distance and scalability challenges.
  • The findings provide a novel foundation for future large-scale quantum communication networks.
  • This research validates a new approach for secure, long-range quantum communication.