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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Related Experiment Video

Updated: May 27, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

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

Published on: September 5, 2019

Reducing multi-photon rates in pulsed down-conversion by temporal multiplexing.

M A Broome1, M P Almeida, A Fedrizzi

  • 1ARC Centre for Engineered Quantum Systems, ARC Centre for Quantum Computer and Communication Technology, School of Mathematics and Physics, University of Queensland, 4072 Brisbane, QLD, Australia. m.a.broome@googlemail.com

Optics Express
|November 24, 2011
PubMed
Summary
This summary is machine-generated.

We developed a simple method to reduce unwanted higher-order photon emissions in quantum experiments. This technique enhances performance in photonic quantum gates, improving interference visibility and entangled state generation.

Related Experiment Videos

Last Updated: May 27, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

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

Published on: September 5, 2019

Area of Science:

  • Quantum optics
  • Laser physics
  • Photonics

Background:

  • Spontaneous parametric down-conversion (SPDC) is a key source of entangled photons.
  • Higher-order photon events in SPDC can degrade the performance of quantum technologies.
  • Existing methods to mitigate these events often involve complex setups or compromises in photon generation rates.

Purpose of the Study:

  • To introduce a straightforward technique for reducing higher-order photon emission rates in pulsed SPDC.
  • To demonstrate the effectiveness of this technique in improving the performance of photonic quantum gates.
  • To enhance the fidelity and entangled state production in two-photon and four-photon experiments.

Main Methods:

  • Utilizing extra-cavity control of a mode-locked ultrafast laser.
  • Simultaneously increasing the repetition rate and decreasing the pulse energy of the pump beam.
  • Applying the modified pump beam to a spontaneous parametric down-conversion source feeding a photonic quantum gate.

Main Results:

  • Successfully reduced the emission rate of higher-order photon events.
  • Observed improved non-classical interference visibility in both two-photon and four-photon experiments.
  • Demonstrated enhanced quantum-gate fidelity and improved entangled state production in the two-photon case.

Conclusions:

  • The presented extra-cavity laser control technique offers a simple and effective way to suppress higher-order photon events in SPDC.
  • This method provides significant improvements for photonic quantum information processing, particularly for quantum gates.
  • The findings pave the way for more robust and efficient quantum optical experiments and applications.