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Randomness-Free Test of Nonclassicality: A Proof of Concept
Zhonghua Ma1, Markus Rambach1, Kaumudibikash Goswami1,2
1Australian Research Council Centre of Excellence for Engineered Quantum Systems and School of Mathematics and Physics, University of Queensland, Queensland 4072, Australia.
Physical Review Letters
|October 13, 2023
Summary
Researchers developed a new, cost-effective method to certify quantum correlations and nonprojective measurements without needing random seeds. This technique offers a novel quantum advantage in correlated coin tossing, paving the way for secure quantum communications.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Quantum Foundations
Background:
- Quantum correlations and nonprojective measurements are crucial for advanced information-theoretic tasks.
- Current device-independent certification methods rely on costly and potentially insecure seed randomness.
- Existing schemes face challenges in certifying quantum resources without loopholes.
Purpose of the Study:
- To propose and experimentally implement a semi-device-independent technique for certifying quantum correlations and nonprojective measurements.
- To eliminate the need for seed randomness in certifying nonclassical resources.
- To demonstrate a novel quantum advantage in a correlated coin tossing task.
Main Methods:
- Developed a semi-device-independent certification test requiring only prior knowledge of system dimensions.
- Experimentally implemented the technique using pairs of photons entangled in their transverse spatial modes.
- Utilized qubit trine positive operator-valued measures (POVMs) on entangled photon pairs.
Main Results:
- Successfully demonstrated a novel quantum advantage in correlated coin tossing.
- Showed that the quantum correlated coin cannot be replicated by classical correlated coins.
- Certified quantum correlations and nonprojective measurements (qubit trine POVMs) in a semi-device-independent manner.
Conclusions:
- Established a new, cost-effective certification technique for nonclassical shared randomness and nonclassical measurements.
- The method is semi-device independent, requiring only dimension information.
- This advancement is significant for future multiparty quantum communication protocols.
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