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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Published on: November 11, 2013

Quantum Zeno effect in the spatial evolution of a single atom.

Zheng-Yuan Zhang1,2, Han-Chao Chen1,2, Xin Liu1,2

  • 1Laboratory of Quantum Information, University of Science and Technology of China, Hefei, China.

Nature Communications
|June 12, 2026
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Frequent measurements, or the quantum Zeno effect (QZE), can suppress quantum motion. This study demonstrates QZE in real-space atomic motion, enabling precise control over atom movement and state preparation.

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Area of Science:

  • Quantum physics
  • Atomic physics
  • Quantum optics

Background:

  • The quantum Zeno effect (QZE) describes how frequent measurements inhibit quantum systems from evolving.
  • Experimental exploration of QZE's impact on single-atom real-space motion is limited.

Purpose of the Study:

  • To experimentally observe and characterize the quantum Zeno effect in the real-space motion of a single atom.
  • To investigate measurement backaction and its influence on atomic motion dynamics.
  • To establish a framework for measurement-based control of atomic motion.

Main Methods:

  • Utilizing an optical trap as a measurement pulse for a single atom.
  • Monitoring atomic loss to detect the QZE.
  • Dynamically controlling the optical trap's position and parameters (frequency, strength, spatial position).

Main Results:

  • Direct experimental observation of the quantum Zeno effect in single-atom real-space motion.
  • Characterization of measurement backaction as projective measurement followed by unitary evolution.
  • Demonstration that measurement pulses suppress spatial spreading and enable deterministic preparation of motional states.
  • Realization of measurement-induced directional transport exceeding adiabatic limits.

Conclusions:

  • Provides a direct experimental demonstration of QZE in real-space atomic motion.
  • Establishes a versatile framework for measurement-based control of atomic motion.
  • Opens new avenues for motional-state engineering in cold-atom systems.