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Correlative Light- and Electron Microscopy Using Quantum Dot Nanoparticles
Published on: August 7, 2016
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Collective spin correlations and entangled state dynamics in coupled quantum dots.
N S Maslova1, P I Arseyev2, V N Mantsevich1
1Department of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia.
Physical Review. E
|March 18, 2018
Summary
We found that coupling a quantum dot system to an electronic reservoir enhances electron spin correlation and entanglement. This collective behavior can be controlled by adjusting gate voltage, offering new possibilities for quantum information processing.
Area of Science:
- Quantum physics
- Condensed matter physics
- Quantum information science
Background:
- Few-electron states in quantum dots are crucial for quantum technologies.
- Understanding electron dynamics in correlated quantum-dot systems is complex.
- Coupling to an electronic reservoir can significantly alter quantum system behavior.
Purpose of the Study:
- To investigate the dynamics of few-electron states in a correlated double quantum dot coupled to an electronic reservoir.
- To analyze how system symmetry and reservoir coupling affect electron behavior, spin correlation, and entanglement.
- To explore the controllability of these quantum properties via external gate voltage.
Main Methods:
- Analysis of time evolution for two-electron states using kinetic equations.
- Modeling pseudoparticle occupation numbers with constraints on physical states.
- Investigating the impact of reservoir coupling on spin correlation functions and entanglement (concurrence).
Main Results:
- System symmetry governs the dynamics of few-electron states, leading to collective electron behavior.
- Coupling to an electronic reservoir can significantly increase the spin correlation function and degree of entanglement.
- Gate voltage applied to the inter-dot barrier allows for controllable tuning of spin correlation and entanglement.
Conclusions:
- The symmetry of the total system dictates the collective behavior of electrons in coupled quantum dots.
- Reservoir coupling offers a pathway to enhance quantum correlations and entanglement in quantum dot systems.
- Controllable tuning of spin correlation and entanglement is achievable through gate voltage manipulation, paving the way for quantum device applications.
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