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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...
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Related Experiment Video

Updated: Jun 18, 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

Efficient optical quantum state engineering.

Kevin T McCusker1, Paul G Kwiat

  • 1University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. kmccusk3@illinois.edu

Physical Review Letters
|November 13, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed a new, highly efficient method for creating multiphoton quantum states. This technique uses repeated spontaneous parametric down-conversion to generate Fock and N00N states, advancing quantum technology.

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Last Updated: Jun 18, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

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Published on: May 30, 2014

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Area of Science:

  • Quantum optics
  • Quantum information science

Background:

  • Generating multiphoton states is crucial for quantum information processing.
  • Previous methods for creating multiphoton states are often inefficient and complex.

Purpose of the Study:

  • To introduce a novel and efficient method for producing multiphoton states.
  • To demonstrate the generation of specific multiphoton states like Fock and N00N states.

Main Methods:

  • Utilizing repeated spontaneous parametric down-conversion (SPDC).
  • Pseudodeterministically adding photons to a single optical mode over multiple SPDC attempts.

Main Results:

  • Achieved exponential improvement in efficiency compared to prior methods.
  • Demonstrated the capability to produce various several-photon states, including Fock and N00N states.
  • N00N states are number-path entangled states of the form |N(A), 0(B)>+|0(A), N(B)>.

Conclusions:

  • The proposed scheme offers a significant advancement in the efficient generation of multiphoton states.
  • The method has potential applications in quantum computing and quantum communication.
  • Further research should explore experimental limitations and optimize performance.