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Related Concept Videos

Quantum Numbers02:43

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Magnon squeezing in the quantum regime.

Yuan-Chao Weng1, Da Xu2, Zhen Chen3

  • 1Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control, School of Physics, and State Key Laboratory for Extreme Photonics and Instrumentation, Zhejiang University, Hangzhou, China.

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|February 12, 2026
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Summary
This summary is machine-generated.

Researchers experimentally observed quantum squeezing of magnons in a macroscopic yttrium iron garnet sphere. This breakthrough in quantum nonlinear magnonics paves the way for advanced quantum technologies and metrology.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Quantum optics

Background:

  • Squeezed states are vital for quantum metrology and quantum technologies.
  • Demonstrating quantum squeezing in macroscopic spin systems, specifically magnons, has been a significant challenge.

Purpose of the Study:

  • To experimentally observe quantum-level magnon squeezing in a millimeter-scale yttrium iron garnet (YIG) sphere.
  • To generate squeezed magnon states with a mean magnon number less than one.

Main Methods:

  • Engineered a strong dispersive magnon-superconducting qubit coupling using a microwave cavity.
  • Implemented a self-Kerr nonlinearity to generate squeezed magnon states.
  • Utilized a magnon-assisted Raman process for Wigner tomography.

Main Results:

  • Achieved experimental observation of quantum magnon squeezing in a YIG sphere.
  • Generated squeezed magnon states with quadrature variances of approximately 0.8 (~1.0 dB squeezing) below the vacuum level.
  • Demonstrated mean magnon numbers less than one.

Conclusions:

  • Laid the groundwork for quantum nonlinear magnonics.
  • Showcased potential applications in quantum metrology.
  • Opened new avenues for exploring quantum phenomena in macroscopic spin systems.