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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Resource-Efficient Measurement-Device-Independent Entanglement Witness
E Verbanis1, A Martin1, D Rosset1
1Group of Applied Physics, University of Geneva, 1211 Geneva, Switzerland.
Physical Review Letters
|May 28, 2016
Summary
Measurement-device-independent entanglement witness (MDI-EW) schemes overcome experimental imperfections in quantum systems. This study enhances MDI-EW to witness all entangled qubit states without prior state knowledge, demonstrating robustness against noise.
Area of Science:
- Quantum Information Science
- Experimental Quantum Physics
Background:
- Experimental imperfections can lead to overestimated entanglement in quantum systems.
- Measurement-device-independent entanglement witness (MDI-EW) offers a robust solution by being independent of detection efficiencies and classical communication.
Purpose of the Study:
- To extend MDI-EW theory, removing the need for prior knowledge of two-qubit states.
- To experimentally implement a simplified MDI-EW for enhanced practicality.
Main Methods:
- Theoretical extension of MDI-EW to a device-independent framework without state-knowledge requirements.
- Novel experimental setup for MDI-EW implementation, reducing complexity.
- Application to a bipartite Werner state to assess robustness against noise.
Main Results:
- Demonstrated a method to witness entanglement without prior knowledge of the quantum states.
- Successfully implemented a simplified MDI-EW experiment.
- Showcased robustness against noise, witnessing entanglement in a Werner state with a fidelity down to 0.4.
Conclusions:
- The enhanced MDI-EW is a versatile and robust tool for detecting entanglement across various quantum systems.
- The simplified experimental implementation makes advanced entanglement verification more accessible.
- This work advances the reliable characterization of quantum states in the presence of experimental imperfections.
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