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Proposal for a loophole-free Bell test using homodyne detection
R García-Patrón1, J Fiurásek, N J Cerf
1QUIC, Ecole Polytechnique, CP 165, Université Libre de Bruxelles, 1050 Bruxelles, Belgium.
Physical Review Letters
|November 5, 2004
Summary
Researchers propose a new optical setup for a loophole-free Bell test using non-Gaussian entangled states and efficient homodyne detection. This method promises a complete experimental Bell test with high fidelity.
Area of Science:
- Quantum Optics
- Quantum Information Science
- Experimental Physics
Background:
- Bell tests are crucial for verifying quantum mechanics and exploring non-locality.
- Previous experiments faced challenges with loopholes and detector inefficiencies.
- Non-Gaussian entangled states are key to advanced quantum protocols.
Purpose of the Study:
- To propose a feasible optical setup for a loophole-free Bell test.
- To utilize non-Gaussian entangled states generated via photon subtraction.
- To achieve high fidelity with efficient homodyne detection.
Main Methods:
- Generation of non-Gaussian entangled states from two-mode squeezed vacuum.
- Employing beam splitters and low-efficiency single-photon detectors for photon subtraction.
- Utilizing efficient homodyne detection for measurement.
Main Results:
- A Bell violation exceeding 1% is predicted.
- The setup requires 6 dB squeezed light and ~95% homodyne efficiency.
- Feasibility is supported by recent experimental advancements in non-Gaussian state generation.
Conclusions:
- The proposed method offers a promising route towards a complete experimental Bell test.
- Efficient homodyne detection is critical for success.
- This work advances the experimental verification of quantum non-locality.