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This study explores weak measurement in atomic systems by measuring phase coherence, not density. This novel approach enables new quantum states distinct from conventional methods.

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Area of Science:

  • Quantum optics
  • Many-body physics
  • Quantum measurement

Background:

  • Atomic systems coupled to light are typically studied via on-site density measurements.
  • Weak measurement offers a less disruptive probe of quantum systems.
  • Understanding quantum backaction is crucial for controlling quantum evolution.

Purpose of the Study:

  • To investigate the effects of weak measurement on many-body atomic systems by focusing on matter-phase-related variables.
  • To explore novel quantum states achievable through unconventional measurement strategies.
  • To extend the understanding of quantum measurement in scenarios with strong competition between evolution and measurement.

Main Methods:

  • Coupling a many-body atomic system to quantized light.
  • Performing weak measurements on matter-phase-related variables, specifically global phase coherence.
  • Analyzing the quantum backaction of these measurements on the system's evolution.

Main Results:

  • Demonstrated a new approach to weak measurement by targeting global phase coherence.
  • Showcased how this method can influence and control system evolution.
  • Identified a new class of final quantum states not accessible through standard techniques.
  • Characterized these states by a blend of Hamiltonian and measurement properties.

Conclusions:

  • Unconventional weak measurement of phase coherence offers unique control over atomic systems.
  • This technique generates novel quantum states, expanding the possibilities beyond dissipative or projective methods.
  • The findings extend the quantum measurement postulate to complex systems with competing dynamics.