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Quantum discord protection from amplitude damping decoherence
Optics Express
|October 20, 2015
Summary
Quantum discord, a measure of quantum correlation, can be protected from decoherence using weak measurements and quantum measurement reversal. This allows for the distribution of quantum correlations in noisy quantum information systems.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Quantum Communication
Background:
- Entanglement is a key resource in quantum information processing.
- Quantum discord offers an alternative measure of quantum correlations.
- Decoherence, particularly amplitude damping, degrades quantum states.
Purpose of the Study:
- To investigate the impact of amplitude damping decoherence on entropic and geometric discord.
- To explore a protocol for protecting quantum discord from decoherence.
- To enable the distribution of quantum correlations in noisy environments.
Main Methods:
- Analysis of entropic discord and geometric discord under amplitude damping.
- Implementation of a protocol involving weak measurement and quantum measurement reversal.
- Theoretical modeling of quantum correlation distribution in a noisy channel.
Main Results:
- Amplitude damping significantly reduces both entropic and geometric discord.
- The proposed protocol effectively preserves quantum discord against amplitude damping.
- Successful distribution of quantum correlations between remote parties was demonstrated.
Conclusions:
- Quantum discord is susceptible to amplitude damping decoherence.
- Weak measurement and reversal protocols offer robust protection for quantum discord.
- This approach facilitates quantum correlation distribution in realistic noisy quantum systems.
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