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Related Concept Videos

Continuous Charge Distributions01:17

Continuous Charge Distributions

Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
The electric charge can also be subjected to an analogical...
Energy Associated With a Charge Distribution01:21

Energy Associated With a Charge Distribution

The work done to bring a charge through a distance r is given by the potential difference between the initial and the final position. To assemble a collection of point charges, the total work done can be expressed in terms of the product of each pair of charges divided by their separation distance, defined with respect to a suitable origin. Solving this expression gives the energy stored in a point charge distribution.
Equilibrium Conditions for a Particle01:23

Equilibrium Conditions for a Particle

When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
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...
Network Function of a Circuit01:25

Network Function of a Circuit

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.
The Entropy as a State Function01:14

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...

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Related Experiment Video

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum entanglement network enabled by a state-multiplexing quantum light source.

Yun-Ru Fan1,2,3, Yue Luo1,3, Kai Guo4

  • 1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731, China.

Light, Science & Applications
|May 11, 2025
PubMed
Summary

This study introduces a novel state-multiplexing quantum light source for scalable quantum networks. The new method significantly reduces wavelength channels needed for secure communication, enhancing network efficiency.

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Area of Science:

  • Quantum Information Technology
  • Quantum Networking
  • Photonics

Background:

  • Fully connected quantum networks utilize wavelength division multiplexing (WDM) for quantum information distribution.
  • Existing entanglement-based networks face scalability challenges due to finite spectrum resources, requiring numerous wavelength channels for multiple users.

Purpose of the Study:

  • To propose and demonstrate a scheme for a WDM entanglement-based quantum network using a state-multiplexing quantum light source.
  • To overcome scalability limitations in current quantum network architectures.

Main Methods:

  • Utilized a state-multiplexing quantum light source with a dual-pump configuration.
  • Employed a silicon nitride microring resonator chip to generate state-multiplexing photon pairs across multiple wavelength channels.
  • Established a fully connected network graph connecting four users.

Main Results:

  • Successfully generated state-multiplexing photon pairs at multiple wavelengths.
  • Demonstrated a fully connected network using six wavelength channels, halving the requirement without compromising security or performance.
  • Achieved a total asymptotic secure key rate of 1946.9 bps using the BBM92 protocol.

Conclusions:

  • The proposed state-multiplexing approach significantly enhances the scalability of WDM entanglement-based quantum networks.
  • This method minimizes infrastructure requirements, paving the way for more practical and widespread quantum network development.