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Witnessing Genuine Multiphoton Indistinguishability
Daniel J Brod1, Ernesto F Galvão1, Niko Viggianiello2
1Instituto de Física, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza s/n, Niterói, Rio de Janeiro 24210-340, Brazil.
Physical Review Letters
|March 2, 2019
Summary
Researchers developed a method using linear interferometers to detect n-boson indistinguishability, crucial for quantum computing. This practical tool quantifies multi-boson indistinguishability, advancing quantum source assessment and fundamental physics.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Fundamental Physics
Background:
- Bosonic interference is key to quantum computational advantage.
- Assessing quantum sources and fundamental phenomena requires reliable methods to witness bosonic interference.
- Quantifying multi-boson indistinguishability is essential for these assessments.
Purpose of the Study:
- To develop a practical method for unambiguously witnessing genuine n-boson indistinguishability.
- To bound the degree of multi-boson indistinguishability using a novel set theory model.
- To experimentally validate the method for three-photon indistinguishability.
Main Methods:
- Utilizing linear interferometers to create and test for n-boson indistinguishability.
- Developing a witness that bounds the degree of multi-boson indistinguishability.
- Employing a novel intuitive model based on set theory.
- Experimental implementation using parametric down-conversion to generate three-photon states.
Main Results:
- Demonstrated a method to unambiguously witness genuine n-boson indistinguishability.
- Quantified the degree of three-photon indistinguishability in experimentally prepared states.
- The violation of the proposed witnesses provides a bound on multi-boson indistinguishability.
Conclusions:
- Linear interferometers offer a practical tool for assessing quantum sources and fundamental physics.
- The developed approach provides a quantitative measure of multi-boson indistinguishability.
- This work advances photonic applications and inspires further research in operational quantum frameworks.
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