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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum decoherence of single-photon counters.

V D'Auria1, N Lee, T Amri

  • 1Laboratoire Kastler Brossel, Université Pierre et Marie Curie, Ecole Normale Supérieure, CNRS, Case 74, 4 place Jussieu, 75252 Paris Cedex 05, France.

Physical Review Letters
|August 27, 2011
PubMed
Summary
This summary is machine-generated.

We experimentally show that quantum detectors lose their quantum properties due to environmental interactions, transitioning to a semi-classical regime. This study quantifies the quantum decoherence of measurement devices.

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Area of Science:

  • Quantum Physics
  • Quantum Information Science
  • Measurement Science

Background:

  • Quantum decoherence fundamentally describes the loss of quantum properties due to environmental interactions.
  • Controlling quantum decoherence is crucial for advancing quantum information processing.
  • The decoherence of quantum states is well-studied, but the decoherence of measurement devices themselves is less understood.

Purpose of the Study:

  • To quantitatively probe the quantum decoherence of measurement devices.
  • To experimentally demonstrate the transition of quantum detectors from a full-quantum to a semi-classical regime.
  • To determine and measure the boundary between these operational regimes.

Main Methods:

  • Investigated the environmental influence on two single-photon counters.
  • Analyzed the vanishing quantum features of the detectors.
  • Experimentally determined the transition point to the semi-classical regime, characterized by a positive Wigner function.

Main Results:

  • Demonstrated that quantum features of single-photon counters degrade in a noisy environment.
  • Observed the transition from quantum operation to a semi-classical regime.
  • Explicitly determined and experimentally measured the boundary between these two regimes.

Conclusions:

  • Quantum detectors are susceptible to decoherence, losing their quantum characteristics.
  • The transition to a semi-classical regime for detectors can be precisely defined and measured.
  • Understanding detector decoherence is vital for reliable quantum information processing.