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Updated: Sep 17, 2025
07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Experimental determination of tripartite quantum discord
Vaishali Gulati1, Shaileyee Bhowmick1, Tim Byrnes2,3,4,5
1Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Manauli, Punjab 140306, India.
Summary
Researchers experimentally measured tripartite quantum discord, a key indicator of quantum correlations, for the first time. This breakthrough reveals discord
Area of Science:
- Quantum Information Science
- Quantum Correlations
- Quantum Measurement
Background:
- Quantum discord quantifies nonclassical correlations, crucial for quantum information processing.
- While bipartite quantum discord is well-studied, multipartite discord remains experimentally elusive.
Purpose of the Study:
- To experimentally measure tripartite quantum discord in a three-qubit system.
- To investigate the behavior and distribution of quantum discord in various multipartite quantum states.
Main Methods:
- Utilized an NMR quantum information processor for experimental measurements.
- Employed quantum state tomography and temporal averaging to prepare mixed states with high fidelity (>95%).
- Applied a theoretical framework based on conditional projective measurements and quantum conditional mutual information.
Main Results:
- Successfully quantified tripartite quantum discord in GHZ, W states, and classical mixtures.
- Demonstrated that quantum discord exists independently of entanglement.
- Validated the nonconvexity of quantum discord, showing mixtures of zero-discord states can have non-zero discord.
Conclusions:
- Established a robust experimental methodology for measuring multipartite quantum discord.
- Highlighted quantum discord as a broader indicator of quantum correlations beyond entanglement.
- Confirmed that quantum discord does not adhere to resource theory frameworks due to its nonconvexity.
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