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Experimental certification of contextuality, coherence, and dimension in a programmable universal photonic processor
Taira Giordani1, Rafael Wagner2,3, Chiara Esposito1
1Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185 Roma, Italy.
Science Advances
|November 3, 2023
Summary
Researchers experimentally certified quantum properties in high-dimensional systems. This work demonstrates efficient certification methods for quantum technologies using photonic processors.
Area of Science:
- Quantum Information Science
- Photonic Technologies
- Quantum Computing
Background:
- High-dimensional quantum states offer enhanced computational and cryptographic capabilities.
- Certifying these quantum properties is challenging due to the complexity of quantum state tomography.
- Developing efficient experimental methods for certification is crucial for advancing quantum technologies.
Purpose of the Study:
- To experimentally certify coherence and dimension witnesses for high-dimensional quantum systems.
- To demonstrate the effectiveness of pairwise overlap measurements for certification.
- To showcase the advantage in quantum interrogation tasks fueled by quantum contextuality.
Main Methods:
- Utilized a six-mode universal photonic processor fabricated with femtosecond laser writing.
- Employed pairwise overlap measurements for coherence and dimension witness certification.
- Tested the approach for quantum systems (qudits) up to dimension 5.
Main Results:
- Successfully certified coherence and dimension witnesses for qudits up to dimension 5.
- Demonstrated an advantage in a quantum interrogation task.
- Confirmed that the demonstrated advantage is driven by quantum contextuality.
Conclusions:
- The developed method provides an efficient approach for certifying quantum properties in integrated photonic platforms.
- This work validates the use of coherence and dimension witnesses for high-dimensional quantum systems.
- The findings pave the way for practical certification of quantum devices and protocols.
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