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Nonexponential Decoherence and Subdiffusion in Atom-Optics Kicked Rotor.

Sumit Sarkar1, Sanku Paul1, Chetan Vishwakarma1

  • 1Department of Physics, Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pune 411 008, India.

Physical Review Letters
|May 13, 2017
PubMed
Summary
This summary is machine-generated.

Quantum systems normally lose coherence exponentially. This study demonstrates slower than exponential coherence decay in an atom-optics kicked rotor system, enabling quantum subdiffusion control.

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Area of Science:

  • Quantum physics
  • Atomic optics
  • Nonlinear dynamics

Background:

  • Quantum systems lose coherence due to environmental interactions, leading to classical behavior.
  • Exponential decay of quantum coherence typically makes macroscopic quantum superpositions unsustainable.

Purpose of the Study:

  • To experimentally investigate and realize slower-than-exponential coherence decay in a quantum system.
  • To explore the potential for controlling quantum coherence dynamics using tailored noise profiles.

Main Methods:

  • Utilized an atom-optics kicked rotor system.
  • Applied nonstationary Lévy noise to the kick sequence.
  • Measured coherence decay, mean energy growth, and momentum profiles.

Main Results:

  • Achieved experimentally slower-than-exponential decay of quantum coherences.
  • Observed quantum subdiffusion, a manifestation of slower coherence decay.
  • Demonstrated control over quantum subdiffusion via the Lévy exponent.

Conclusions:

  • Slower coherence decay is experimentally achievable in quantum systems.
  • Quantum subdiffusion offers a pathway to preserve quantum coherence for longer durations.
  • Experimental findings align with theoretical predictions and numerical simulations.