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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Quantum boomerang effect of light.

Xiangrui Hou1, Zhaoxin Wu1, Fangyu Wang1

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Scientists observed the quantum boomerang effect using light in a disordered waveguide. This effect, where a wave packet returns to its origin, was demonstrated on-chip, paving the way for new physics research.

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Area of Science:

  • Quantum physics
  • Photonics
  • Waveguide optics

Background:

  • The quantum boomerang effect is a theoretical phenomenon where wave packets return to their origin.
  • Experimental studies of this effect, especially with light, are scarce.

Purpose of the Study:

  • To experimentally observe the quantum boomerang effect in a photonic system.
  • To explore methods for controlling and accelerating the effect's return dynamics.

Main Methods:

  • Utilized an on-chip, one-dimensional disordered waveguide lattice.
  • Launched a kinetic light beam and tracked its center of mass (COM).
  • Implemented symmetric gradient loss and time-varying coupling for control.

Main Results:

  • Successfully demonstrated the photonic quantum boomerang effect in real space.
  • Observed the light beam's COM moving away, reversing direction, and returning to the origin.
  • Showcased two experimental methods to accelerate and control the return velocity.

Conclusions:

  • Established a controllable photonic platform for studying boomerang physics.
  • Opened new avenues for research in nonlinear and many-photon regimes of the quantum boomerang effect.