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Related Experiment Videos

Violation of Bell's Inequality Using Continuous Variable Measurements.

Oliver Thearle1,2, Jiri Janousek2, Seiji Armstrong1

  • 1Centre for Quantum Computation and Communication Technology, Research School of Physics and Engineering, The Australian Nation University, Canberra, Australian Capital Territory 2601, Australia.

Physical Review Letters
|February 14, 2018
PubMed
Summary

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Researchers violated a Bell inequality using continuous variable measurements, demonstrating quantum entanglement. This achievement with a four-mode entangled state opens new avenues for device-independent quantum protocols.

Area of Science:

  • Quantum physics
  • Quantum information science

Background:

  • Bell inequalities are crucial for testing quantum mechanics against local hidden variable theories.
  • Previous violations used discrete-variable systems, limiting applications.

Purpose of the Study:

  • To demonstrate a violation of Bell's inequality using continuous variable (CV) measurements.
  • To explore the potential of CV entangled states in quantum information protocols.

Main Methods:

  • Generation of a four-mode entangled state.
  • Utilized homodyne detection for continuous variable quadrature measurements.
  • Performed measurements to calculate the Bell value.

Main Results:

  • A clear violation of Bell's inequality was observed.

Related Experiment Videos

  • The recorded Bell value was B=2.31±0.02.
  • Successfully demonstrated CV Bell inequality violation.

    • Conclusions:

    • Continuous variable states can be used to violate Bell inequalities.
    • This work expands the toolkit for device-independent quantum protocols.
    • Highlights the potential of CV entanglement in quantum information processing.