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Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
Published on: January 15, 2016
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Negative correlations can play a positive role in disordered quantum walks
Marcelo A Pires1, Sílvio M Duarte Queirós2,3
1Centro Brasileiro de Pesquisas Físicas, Rua Dr Xavier Sigaud, 150, Rio de Janeiro, RJ, 22290-180, Brazil.
Scientific Reports
|February 26, 2021
Summary
Negatively correlated temporal disorder in quantum walks surprisingly enhances spin-lattice entanglement entropy more than positive correlation. This finding highlights the significant, underestimated role of negative correlations in quantum entanglement dynamics.
Area of Science:
- Quantum physics
- Quantum information science
- Condensed matter theory
Background:
- Quantum walks are fundamental tools for quantum computation and simulation.
- Temporal disorder can significantly alter quantum walk dynamics.
- The role of correlated disorder in quantum systems is not fully understood.
Purpose of the Study:
- To investigate the impact of temporal disorder with tailored correlations on quantum walks.
- To quantify the effect of negative versus positive correlations on spin-lattice entanglement entropy.
- To re-evaluate the importance of negatively correlated disorder in quantum entanglement.
Main Methods:
- Engineered temporal disorder using a binary Markov chain with controlled correlation (C) and disorder strength (r).
- Analyzed quantum walks under weak disorder conditions.
- Quantified spin-lattice entanglement entropy ([Formula: see text]) as a key metric.
Main Results:
- Weakly disordered quantum walks exhibit counter-intuitive behavior.
- Negative correlation leads to higher spin-lattice entanglement entropy than positive correlation ([Formula: see text] > [Formula: see text]).
- The strength of disorder (r) and correlation (C) are crucial parameters.
Conclusions:
- Negatively correlated temporal disorder is a more potent driver of quantum entanglement than previously assumed.
- This research suggests new avenues for engineering quantum entanglement.
- The findings necessitate a revision of the literature regarding correlated disorder effects.
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