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The Quantum-Mechanical Model of an Atom02:45

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Experimental Demonstration of Robust Quantum Steering.

Sabine Wollmann1,2, Roope Uola3, Ana C S Costa4

  • 1Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1FD, United Kingdom.

Physical Review Letters
|July 24, 2020
PubMed
Summary
This summary is machine-generated.

We demonstrate a new method for quantum steering that is robust against experimental errors. This dimension-bounded steering offers a practical alternative to Bell tests, requiring less trust in measurement devices.

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Area of Science:

  • Quantum Information Science
  • Quantum Foundations

Background:

  • Quantum steering is a key phenomenon in quantum mechanics, demonstrating non-classical correlations.
  • Existing methods for verifying quantum steering often rely on specific assumptions or are sensitive to experimental imperfections.

Purpose of the Study:

  • To analyze and experimentally demonstrate quantum steering using novel criteria.
  • To compare the robustness of different quantum steering criteria against experimental imperfections.

Main Methods:

  • Utilized criteria based on generalized entropies for quantum steering analysis.
  • Employed dimension-bounded steering criteria with minimal assumptions.
  • Investigated robustness against experimental imperfections like measurement misalignment.

Main Results:

  • Entropy-based criteria showed robustness against state preparation imperfections.
  • Dimension-bounded steering demonstrated an advantage in the presence of measurement imprecision.
  • The proposed method is easier to achieve than fully nonlocal correlations.

Conclusions:

  • Dimension-bounded steering offers a practical and device-independent approach to verifying quantum correlations.
  • This method provides a promising candidate for replacing complex Bell tests in experimental settings.
  • The technique requires minimal trust in measurement devices, enhancing its practical applicability.